31440202431 has 16 divisors (see below), whose sum is σ = 45986693760. Its totient is φ = 18948213920.

The previous prime is 31440202427. The next prime is 31440202447. The reversal of 31440202431 is 13420204413.

It is a cyclic number.

It is not a de Polignac number, because 31440202431 - 2² = 31440202427 is a prime.

It is a super-2 number, since 2×31440202431² (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 (31440202471) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2655360 + ... + 2667173.

It is an arithmetic number, because the mean of its divisors is an integer number (2874168360).

Almost surely, 2^31440202431 is an apocalyptic number.

31440202431 is a deficient number, since it is larger than the sum of its proper divisors (14546491329).

31440202431 is a wasteful number, since it uses less digits than its factorization.

31440202431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5322726.

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 31440202431 its reverse (13420204413), we get a palindrome (44860406844).

The spelling of 31440202431 in words is "thirty-one billion, four hundred forty million, two hundred two thousand, four hundred thirty-one".