656213431 has 8 divisors (see below), whose sum is σ = 691055280. Its totient is φ = 621402048.

The previous prime is 656213429. The next prime is 656213449. The reversal of 656213431 is 134312656.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 656213431 - 2¹ = 656213429 is a prime.

It is a super-2 number, since 2×656213431² = 861232134049583522, 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 = 656213393 and 656213402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656213401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46545 + ... + 58981.

It is an arithmetic number, because the mean of its divisors is an integer number (86381910).

Almost surely, 2^656213431 is an apocalyptic number.

656213431 is a deficient number, since it is larger than the sum of its proper divisors (34841849).

656213431 is a wasteful number, since it uses less digits than its factorization.

656213431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15233.

The product of its digits is 12960, while the sum is 31.

The square root of 656213431 is about 25616.6631511600. The cubic root of 656213431 is about 868.9905193575.

The spelling of 656213431 in words is "six hundred fifty-six million, two hundred thirteen thousand, four hundred thirty-one".