31212403431 has 8 divisors (see below), whose sum is σ = 45399859584. Its totient is φ = 18916608120.

The previous prime is 31212403423. The next prime is 31212403447. The reversal of 31212403431 is 13430421213.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31212403431 - 2³ = 31212403423 is a prime.

It is a super-2 number, since 2×31212403431² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31212403931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 472915171 + ... + 472915236.

It is an arithmetic number, because the mean of its divisors is an integer number (5674982448).

Almost surely, 2^31212403431 is an apocalyptic number.

31212403431 is a deficient number, since it is larger than the sum of its proper divisors (14187456153).

31212403431 is a wasteful number, since it uses less digits than its factorization.

31212403431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 945830421.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 31212403431 its reverse (13430421213), we get a palindrome (44642824644).

The spelling of 31212403431 in words is "thirty-one billion, two hundred twelve million, four hundred three thousand, four hundred thirty-one".