478978502531 has 2 divisors, whose sum is σ = 478978502532. Its totient is φ = 478978502530.

The previous prime is 478978502369. The next prime is 478978502537. The reversal of 478978502531 is 135205879874.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 478978502531 - 2²² = 478974308227 is a prime.

It is a super-2 number, since 2×478978502531² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (478978502537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 239489251265 + 239489251266.

It is an arithmetic number, because the mean of its divisors is an integer number (239489251266).

Almost surely, 2^478978502531 is an apocalyptic number.

478978502531 is a deficient number, since it is larger than the sum of its proper divisors (1).

478978502531 is an equidigital number, since it uses as much as digits as its factorization.

478978502531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16934400, while the sum is 59.

The spelling of 478978502531 in words is "four hundred seventy-eight billion, nine hundred seventy-eight million, five hundred two thousand, five hundred thirty-one".