521117117 has 2 divisors, whose sum is σ = 521117118. Its totient is φ = 521117116.

The previous prime is 521117111. The next prime is 521117131. The reversal of 521117117 is 711711125.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 479566201 + 41550916 = 21899^2 + 6446^2 .

It is a cyclic number.

It is not a de Polignac number, because 521117117 - 2¹⁴ = 521100733 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521117111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260558558 + 260558559.

It is an arithmetic number, because the mean of its divisors is an integer number (260558559).

Almost surely, 2^521117117 is an apocalyptic number.

It is an amenable number.

521117117 is a deficient number, since it is larger than the sum of its proper divisors (1).

521117117 is an equidigital number, since it uses as much as digits as its factorization.

521117117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 490, while the sum is 26.

The square root of 521117117 is about 22827.9897713312. The cubic root of 521117117 is about 804.7205887022.

The spelling of 521117117 in words is "five hundred twenty-one million, one hundred seventeen thousand, one hundred seventeen".