31356819520769 has 2 divisors, whose sum is σ = 31356819520770. Its totient is φ = 31356819520768.

The previous prime is 31356819520723. The next prime is 31356819520787. The reversal of 31356819520769 is 96702591865313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20192620704400 + 11164198816369 = 4493620^2 + 3341287^2 .

It is a cyclic number.

It is not a de Polignac number, because 31356819520769 - 2⁸ = 31356819520513 is a prime.

It is a super-2 number, since 2×31356819520769² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31356819520669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15678409760384 + 15678409760385.

It is an arithmetic number, because the mean of its divisors is an integer number (15678409760385).

Almost surely, 2^{31356819520769} is an apocalyptic number.

It is an amenable number.

31356819520769 is a deficient number, since it is larger than the sum of its proper divisors (1).

31356819520769 is an equidigital number, since it uses as much as digits as its factorization.

31356819520769 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 73483200, while the sum is 65.

The spelling of 31356819520769 in words is "thirty-one trillion, three hundred fifty-six billion, eight hundred nineteen million, five hundred twenty thousand, seven hundred sixty-nine".