45123831 has 32 divisors (see below), whose sum is σ = 72722880. Its totient is φ = 27537408.

The previous prime is 45123809. The next prime is 45123853. The reversal of 45123831 is 13832154.

It is a happy number.

45123831 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (45123809) and next prime (45123853).

It is not a de Polignac number, because 45123831 - 2⁹ = 45123319 is a prime.

It is a super-2 number, since 2×45123831² = 4072320248233122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 45123795 and 45123804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45123031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15655 + ... + 18311.

It is an arithmetic number, because the mean of its divisors is an integer number (2272590).

Almost surely, 2^45123831 is an apocalyptic number.

45123831 is a deficient number, since it is larger than the sum of its proper divisors (27599049).

45123831 is a wasteful number, since it uses less digits than its factorization.

45123831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2720 (or 2714 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 45123831 is about 6717.4274093584. The cubic root of 45123831 is about 356.0152936030.

Adding to 45123831 its reverse (13832154), we get a palindrome (58955985).

It can be divided in two parts, 45123 and 831, that added together give a palindrome (45954).

The spelling of 45123831 in words is "forty-five million, one hundred twenty-three thousand, eight hundred thirty-one".