31420231631 has 2 divisors, whose sum is σ = 31420231632. Its totient is φ = 31420231630.

The previous prime is 31420231573. The next prime is 31420231639. The reversal of 31420231631 is 13613202413.

It is a strong prime.

It is an emirp because it is prime and its reverse (13613202413) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31420231631 - 2¹⁴ = 31420215247 is a prime.

It is a super-2 number, since 2×31420231631² (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 31420231631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31420231639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15710115815 + 15710115816.

It is an arithmetic number, because the mean of its divisors is an integer number (15710115816).

Almost surely, 2^31420231631 is an apocalyptic number.

31420231631 is a deficient number, since it is larger than the sum of its proper divisors (1).

31420231631 is an equidigital number, since it uses as much as digits as its factorization.

31420231631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 26.

The spelling of 31420231631 in words is "thirty-one billion, four hundred twenty million, two hundred thirty-one thousand, six hundred thirty-one".