656351401 has 4 divisors (see below), whose sum is σ = 659683332. Its totient is φ = 653019472.

The previous prime is 656351393. The next prime is 656351491. The reversal of 656351401 is 104153656.

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

It can be written as a sum of positive squares in 2 ways, for example, as 422261401 + 234090000 = 20549^2 + 15300^2 .

It is a cyclic number.

It is not a de Polignac number, because 656351401 - 2³ = 656351393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (656351491) 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, 1665670 + ... + 1666063.

It is an arithmetic number, because the mean of its divisors is an integer number (164920833).

Almost surely, 2^656351401 is an apocalyptic number.

It is an amenable number.

656351401 is a deficient number, since it is larger than the sum of its proper divisors (3331931).

656351401 is a wasteful number, since it uses less digits than its factorization.

656351401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3331930.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 656351401 is about 25619.3559833186. The cubic root of 656351401 is about 869.0514173391.

The spelling of 656351401 in words is "six hundred fifty-six million, three hundred fifty-one thousand, four hundred one".