31213044632639 has 2 divisors, whose sum is σ = 31213044632640. Its totient is φ = 31213044632638.

The previous prime is 31213044632563. The next prime is 31213044632659. The reversal of 31213044632639 is 93623644031213.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31213044632639 - 2¹² = 31213044628543 is a prime.

It is a super-2 number, since 2×31213044632639² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31213044632593 and 31213044632602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31213044632659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15606522316319 + 15606522316320.

It is an arithmetic number, because the mean of its divisors is an integer number (15606522316320).

Almost surely, 2^{31213044632639} is an apocalyptic number.

31213044632639 is a deficient number, since it is larger than the sum of its proper divisors (1).

31213044632639 is an equidigital number, since it uses as much as digits as its factorization.

31213044632639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1679616, while the sum is 47.

The spelling of 31213044632639 in words is "thirty-one trillion, two hundred thirteen billion, forty-four million, six hundred thirty-two thousand, six hundred thirty-nine".