31201242431 has 4 divisors (see below), whose sum is σ = 31201778712. Its totient is φ = 31200706152.

The previous prime is 31201242379. The next prime is 31201242439. The reversal of 31201242431 is 13424210213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13424210213 = 613 ⋅21899201.

It is a cyclic number.

It is not a de Polignac number, because 31201242431 - 2¹⁸ = 31200980287 is a prime.

It is a super-2 number, since 2×31201242431² (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 = 31201242397 and 31201242406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31201242439) 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, 168536 + ... + 301341.

It is an arithmetic number, because the mean of its divisors is an integer number (7800444678).

Almost surely, 2^31201242431 is an apocalyptic number.

31201242431 is a deficient number, since it is larger than the sum of its proper divisors (536281).

31201242431 is an equidigital number, since it uses as much as digits as its factorization.

31201242431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536280.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 31201242431 its reverse (13424210213), we get a palindrome (44625452644).

The spelling of 31201242431 in words is "thirty-one billion, two hundred one million, two hundred forty-two thousand, four hundred thirty-one".