656431 has 4 divisors (see below), whose sum is σ = 691000. Its totient is φ = 621864.

The previous prime is 656429. The next prime is 656459. The reversal of 656431 is 134656.

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 656431 - 2¹ = 656429 is a prime.

It is a super-2 number, since 2×656431² = 861803315522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 656396 and 656405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656471) 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, 17256 + ... + 17293.

It is an arithmetic number, because the mean of its divisors is an integer number (172750).

2⁶⁵⁶⁴³¹ is an apocalyptic number.

656431 is a deficient number, since it is larger than the sum of its proper divisors (34569).

656431 is a wasteful number, since it uses less digits than its factorization.

656431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34568.

The product of its digits is 2160, while the sum is 25.

The square root of 656431 is about 810.2042952244. The cubic root of 656431 is about 86.9086547315.

The spelling of 656431 in words is "six hundred fifty-six thousand, four hundred thirty-one".