31405662131 has 2 divisors, whose sum is σ = 31405662132. Its totient is φ = 31405662130.

The previous prime is 31405662091. The next prime is 31405662163. The reversal of 31405662131 is 13126650413.

It is an a-pointer prime, because the next prime (31405662163) can be obtained adding 31405662131 to its sum of digits (32).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31405662131 - 2¹⁰ = 31405661107 is a prime.

It is a super-2 number, since 2×31405662131² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31455662131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15702831065 + 15702831066.

It is an arithmetic number, because the mean of its divisors is an integer number (15702831066).

Almost surely, 2^31405662131 is an apocalyptic number.

31405662131 is a deficient number, since it is larger than the sum of its proper divisors (1).

31405662131 is an equidigital number, since it uses as much as digits as its factorization.

31405662131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 32.

The spelling of 31405662131 in words is "thirty-one billion, four hundred five million, six hundred sixty-two thousand, one hundred thirty-one".