478511557 has 2 divisors, whose sum is σ = 478511558. Its totient is φ = 478511556.

The previous prime is 478511549. The next prime is 478511581. The reversal of 478511557 is 755115874.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 251888641 + 226622916 = 15871^2 + 15054^2 .

It is a cyclic number.

It is not a de Polignac number, because 478511557 - 2³ = 478511549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (478511587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 239255778 + 239255779.

It is an arithmetic number, because the mean of its divisors is an integer number (239255779).

Almost surely, 2^478511557 is an apocalyptic number.

It is an amenable number.

478511557 is a deficient number, since it is larger than the sum of its proper divisors (1).

478511557 is an equidigital number, since it uses as much as digits as its factorization.

478511557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 196000, while the sum is 43.

The square root of 478511557 is about 21874.9070169452. The cubic root of 478511557 is about 782.1633767311.

The spelling of 478511557 in words is "four hundred seventy-eight million, five hundred eleven thousand, five hundred fifty-seven".