521440979 has 2 divisors, whose sum is σ = 521440980. Its totient is φ = 521440978.

The previous prime is 521440957. The next prime is 521441023. The reversal of 521440979 is 979044125.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-521440979 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (521440379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260720489 + 260720490.

It is an arithmetic number, because the mean of its divisors is an integer number (260720490).

Almost surely, 2^521440979 is an apocalyptic number.

521440979 is a deficient number, since it is larger than the sum of its proper divisors (1).

521440979 is an equidigital number, since it uses as much as digits as its factorization.

521440979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 41.

The square root of 521440979 is about 22835.0821982317. The cubic root of 521440979 is about 804.8872591364.

The spelling of 521440979 in words is "five hundred twenty-one million, four hundred forty thousand, nine hundred seventy-nine".