31242005423 has 4 divisors (see below), whose sum is σ = 31545325968. Its totient is φ = 30938684880.

The previous prime is 31242005407. The next prime is 31242005429. The reversal of 31242005423 is 32450024213.

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 31242005423 - 2⁴ = 31242005407 is a prime.

It is a super-2 number, since 2×31242005423² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31242005392 and 31242005401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31242005429) 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, 151660118 + ... + 151660323.

It is an arithmetic number, because the mean of its divisors is an integer number (7886331492).

Almost surely, 2^31242005423 is an apocalyptic number.

31242005423 is a deficient number, since it is larger than the sum of its proper divisors (303320545).

31242005423 is a wasteful number, since it uses less digits than its factorization.

31242005423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303320544.

The product of its (nonzero) digits is 5760, while the sum is 26.

Adding to 31242005423 its reverse (32450024213), we get a palindrome (63692029636).

The spelling of 31242005423 in words is "thirty-one billion, two hundred forty-two million, five thousand, four hundred twenty-three".