479807981 has 2 divisors, whose sum is σ = 479807982. Its totient is φ = 479807980.

The previous prime is 479807963. The next prime is 479808023. The reversal of 479807981 is 189708974.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 411481225 + 68326756 = 20285^2 + 8266^2 .

It is a cyclic number.

It is not a de Polignac number, because 479807981 - 2²⁶ = 412699117 is a prime.

It is a super-2 number, since 2×479807981² = 460431397262592722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (479807921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 239903990 + 239903991.

It is an arithmetic number, because the mean of its divisors is an integer number (239903991).

Almost surely, 2^479807981 is an apocalyptic number.

It is an amenable number.

479807981 is a deficient number, since it is larger than the sum of its proper divisors (1).

479807981 is an equidigital number, since it uses as much as digits as its factorization.

479807981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1016064, while the sum is 53.

The square root of 479807981 is about 21904.5196477805. The cubic root of 479807981 is about 782.8691075071.

The spelling of 479807981 in words is "four hundred seventy-nine million, eight hundred seven thousand, nine hundred eighty-one".