31541402231 has 2 divisors, whose sum is σ = 31541402232. Its totient is φ = 31541402230.

The previous prime is 31541402227. The next prime is 31541402261. The reversal of 31541402231 is 13220414513.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31541402231 - 2² = 31541402227 is a prime.

It is a super-2 number, since 2×31541402231² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31541402231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31541402261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15770701115 + 15770701116.

It is an arithmetic number, because the mean of its divisors is an integer number (15770701116).

Almost surely, 2^31541402231 is an apocalyptic number.

31541402231 is a deficient number, since it is larger than the sum of its proper divisors (1).

31541402231 is an equidigital number, since it uses as much as digits as its factorization.

31541402231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 31541402231 its reverse (13220414513), we get a palindrome (44761816744).

The spelling of 31541402231 in words is "thirty-one billion, five hundred forty-one million, four hundred two thousand, two hundred thirty-one".