521116117 has 2 divisors, whose sum is σ = 521116118. Its totient is φ = 521116116.

The previous prime is 521116091. The next prime is 521116133. The reversal of 521116117 is 711611125.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 431226756 + 89889361 = 20766^2 + 9481^2 .

It is a cyclic number.

It is not a de Polignac number, because 521116117 - 2¹⁵ = 521083349 is a prime.

It is equal to p_27408130 and since 521116117 and 27408130 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 521116091 and 521116100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521116157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260558058 + 260558059.

It is an arithmetic number, because the mean of its divisors is an integer number (260558059).

Almost surely, 2^521116117 is an apocalyptic number.

It is an amenable number.

521116117 is a deficient number, since it is larger than the sum of its proper divisors (1).

521116117 is an equidigital number, since it uses as much as digits as its factorization.

521116117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 420, while the sum is 25.

The square root of 521116117 is about 22827.9678683846. The cubic root of 521116117 is about 804.7200739611.

The spelling of 521116117 in words is "five hundred twenty-one million, one hundred sixteen thousand, one hundred seventeen".