656047531 has 4 divisors (see below), whose sum is σ = 656174272. Its totient is φ = 655920792.

The previous prime is 656047507. The next prime is 656047537. The reversal of 656047531 is 135740656.

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 656047531 - 2⁵ = 656047499 is a prime.

It is a super-2 number, since 2×656047531² = 860796725862391922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (656047537) 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, 55260 + ... + 66073.

It is an arithmetic number, because the mean of its divisors is an integer number (164043568).

Almost surely, 2^656047531 is an apocalyptic number.

656047531 is a deficient number, since it is larger than the sum of its proper divisors (126741).

656047531 is a wasteful number, since it uses less digits than its factorization.

656047531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126740.

The product of its (nonzero) digits is 75600, while the sum is 37.

The square root of 656047531 is about 25613.4248198088. The cubic root of 656047531 is about 868.9172821702.

The spelling of 656047531 in words is "six hundred fifty-six million, forty-seven thousand, five hundred thirty-one".