45131231 has 4 divisors (see below), whose sum is σ = 46351032. Its totient is φ = 43911432.

The previous prime is 45131227. The next prime is 45131237. The reversal of 45131231 is 13213154.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 45131231 - 2² = 45131227 is a prime.

It is a super-2 number, since 2×45131231² = 4073656023150722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45131237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 609845 + ... + 609918.

It is an arithmetic number, because the mean of its divisors is an integer number (11587758).

Almost surely, 2^45131231 is an apocalyptic number.

45131231 is a deficient number, since it is larger than the sum of its proper divisors (1219801).

45131231 is a wasteful number, since it uses less digits than its factorization.

45131231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1219800.

The product of its digits is 360, while the sum is 20.

The square root of 45131231 is about 6717.9781928792. The cubic root of 45131231 is about 356.0347538978.

Adding to 45131231 its reverse (13213154), we get a palindrome (58344385).

The spelling of 45131231 in words is "forty-five million, one hundred thirty-one thousand, two hundred thirty-one".