521031997117 has 2 divisors, whose sum is σ = 521031997118. Its totient is φ = 521031997116.

The previous prime is 521031997069. The next prime is 521031997217. The reversal of 521031997117 is 711799130125.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 490813737561 + 30218259556 = 700581^2 + 173834^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-521031997117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521031997217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260515998558 + 260515998559.

It is an arithmetic number, because the mean of its divisors is an integer number (260515998559).

Almost surely, 2^521031997117 is an apocalyptic number.

It is an amenable number.

521031997117 is a deficient number, since it is larger than the sum of its proper divisors (1).

521031997117 is an equidigital number, since it uses as much as digits as its factorization.

521031997117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 119070, while the sum is 46.

The spelling of 521031997117 in words is "five hundred twenty-one billion, thirty-one million, nine hundred ninety-seven thousand, one hundred seventeen".