31356450220499 has 2 divisors, whose sum is σ = 31356450220500. Its totient is φ = 31356450220498.

The previous prime is 31356450220457. The next prime is 31356450220573. The reversal of 31356450220499 is 99402205465313.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31356450220499 - 2²⁸ = 31356181785043 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31356450220499.

It is not a weakly prime, because it can be changed into another prime (31356450220429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15678225110249 + 15678225110250.

It is an arithmetic number, because the mean of its divisors is an integer number (15678225110250).

Almost surely, 2^{31356450220499} is an apocalyptic number.

31356450220499 is a deficient number, since it is larger than the sum of its proper divisors (1).

31356450220499 is an equidigital number, since it uses as much as digits as its factorization.

31356450220499 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6998400, while the sum is 53.

The spelling of 31356450220499 in words is "thirty-one trillion, three hundred fifty-six billion, four hundred fifty million, two hundred twenty thousand, four hundred ninety-nine".