31351389439 has 2 divisors, whose sum is σ = 31351389440. Its totient is φ = 31351389438.

The previous prime is 31351389427. The next prime is 31351389463. The reversal of 31351389439 is 93498315313.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31351389439 - 2¹¹ = 31351387391 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31351389392 and 31351389401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31351389479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15675694719 + 15675694720.

It is an arithmetic number, because the mean of its divisors is an integer number (15675694720).

Almost surely, 2^31351389439 is an apocalyptic number.

31351389439 is a deficient number, since it is larger than the sum of its proper divisors (1).

31351389439 is an equidigital number, since it uses as much as digits as its factorization.

31351389439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1049760, while the sum is 49.

The spelling of 31351389439 in words is "thirty-one billion, three hundred fifty-one million, three hundred eighty-nine thousand, four hundred thirty-nine".