656461491 has 8 divisors (see below), whose sum is σ = 1000322304. Its totient is φ = 375120840.

The previous prime is 656461489. The next prime is 656461501. The reversal of 656461491 is 194164656.

656461491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 656461491 - 2¹ = 656461489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (656461441) 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, 15630015 + ... + 15630056.

It is an arithmetic number, because the mean of its divisors is an integer number (125040288).

Almost surely, 2^656461491 is an apocalyptic number.

656461491 is a deficient number, since it is larger than the sum of its proper divisors (343860813).

656461491 is a wasteful number, since it uses less digits than its factorization.

656461491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31260081.

The product of its digits is 155520, while the sum is 42.

The square root of 656461491 is about 25621.5044640240. The cubic root of 656461491 is about 869.1000033667.

The spelling of 656461491 in words is "six hundred fifty-six million, four hundred sixty-one thousand, four hundred ninety-one".