521475979 has 2 divisors, whose sum is σ = 521475980. Its totient is φ = 521475978.

The previous prime is 521475973. The next prime is 521475989. The reversal of 521475979 is 979574125.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 521475979 - 2²³ = 513087371 is a prime.

It is not a weakly prime, because it can be changed into another prime (521475973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260737989 + 260737990.

It is an arithmetic number, because the mean of its divisors is an integer number (260737990).

Almost surely, 2^521475979 is an apocalyptic number.

521475979 is a deficient number, since it is larger than the sum of its proper divisors (1).

521475979 is an equidigital number, since it uses as much as digits as its factorization.

521475979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 793800, while the sum is 49.

The square root of 521475979 is about 22835.8485500320. The cubic root of 521475979 is about 804.9052671980.

The spelling of 521475979 in words is "five hundred twenty-one million, four hundred seventy-five thousand, nine hundred seventy-nine".