557908961 has 4 divisors (see below), whose sum is σ = 570883632. Its totient is φ = 544934292.

The previous prime is 557908919. The next prime is 557908963. The reversal of 557908961 is 169809755.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 169809755 = 5 ⋅33961951.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-557908961 is a prime.

It is a super-2 number, since 2×557908961² = 622524817528199042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (557908963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6487271 + ... + 6487356.

It is an arithmetic number, because the mean of its divisors is an integer number (142720908).

Almost surely, 2^557908961 is an apocalyptic number.

It is an amenable number.

557908961 is a deficient number, since it is larger than the sum of its proper divisors (12974671).

557908961 is a wasteful number, since it uses less digits than its factorization.

557908961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12974670.

The product of its (nonzero) digits is 680400, while the sum is 50.

The square root of 557908961 is about 23620.0965493370. The cubic root of 557908961 is about 823.2298555757.

The spelling of 557908961 in words is "five hundred fifty-seven million, nine hundred eight thousand, nine hundred sixty-one".