521700979 has 2 divisors, whose sum is σ = 521700980. Its totient is φ = 521700978.

The previous prime is 521700961. The next prime is 521701003. The reversal of 521700979 is 979007125.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 521700979 - 2¹⁷ = 521569907 is a prime.

It is a super-2 number, since 2×521700979² = 544343822979116882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (521700919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260850489 + 260850490.

It is an arithmetic number, because the mean of its divisors is an integer number (260850490).

Almost surely, 2^521700979 is an apocalyptic number.

521700979 is a deficient number, since it is larger than the sum of its proper divisors (1).

521700979 is an equidigital number, since it uses as much as digits as its factorization.

521700979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 39690, while the sum is 40.

The square root of 521700979 is about 22840.7744833664. The cubic root of 521700979 is about 805.0210140728.

The spelling of 521700979 in words is "five hundred twenty-one million, seven hundred thousand, nine hundred seventy-nine".