656280491 has 4 divisors (see below), whose sum is σ = 671542872. Its totient is φ = 641018112.

The previous prime is 656280487. The next prime is 656280511. The reversal of 656280491 is 194082656.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 656280491 - 2² = 656280487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (656280421) 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, 7631126 + ... + 7631211.

It is an arithmetic number, because the mean of its divisors is an integer number (167885718).

Almost surely, 2^656280491 is an apocalyptic number.

656280491 is a deficient number, since it is larger than the sum of its proper divisors (15262381).

656280491 is a wasteful number, since it uses less digits than its factorization.

656280491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15262380.

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 656280491 is about 25617.9720313689. The cubic root of 656280491 is about 869.0201197469.

The spelling of 656280491 in words is "six hundred fifty-six million, two hundred eighty thousand, four hundred ninety-one".