31440043231 has 2 divisors, whose sum is σ = 31440043232. Its totient is φ = 31440043230.

The previous prime is 31440043181. The next prime is 31440043241. The reversal of 31440043231 is 13234004413.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31440043231 - 2¹⁵ = 31440010463 is a prime.

It is a super-2 number, since 2×31440043231² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31440043196 and 31440043205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31440043241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15720021615 + 15720021616.

It is an arithmetic number, because the mean of its divisors is an integer number (15720021616).

Almost surely, 2^31440043231 is an apocalyptic number.

31440043231 is a deficient number, since it is larger than the sum of its proper divisors (1).

31440043231 is an equidigital number, since it uses as much as digits as its factorization.

31440043231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 31440043231 its reverse (13234004413), we get a palindrome (44674047644).

The spelling of 31440043231 in words is "thirty-one billion, four hundred forty million, forty-three thousand, two hundred thirty-one".