656953381 has 4 divisors (see below), whose sum is σ = 750803872. Its totient is φ = 563102892.

The previous prime is 656953379. The next prime is 656953399. The reversal of 656953381 is 183359656.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 656953381 - 2¹ = 656953379 is a prime.

It is a super-2 number, since 2×656953381² = 863175489614662322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656953331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46925235 + ... + 46925248.

It is an arithmetic number, because the mean of its divisors is an integer number (187700968).

Almost surely, 2^656953381 is an apocalyptic number.

It is an amenable number.

656953381 is a deficient number, since it is larger than the sum of its proper divisors (93850491).

656953381 is an equidigital number, since it uses as much as digits as its factorization.

656953381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93850490.

The product of its digits is 583200, while the sum is 46.

The square root of 656953381 is about 25631.1018296132. The cubic root of 656953381 is about 869.3170228845.

The spelling of 656953381 in words is "six hundred fifty-six million, nine hundred fifty-three thousand, three hundred eighty-one".