630656261 has 4 divisors (see below), whose sum is σ = 630840000. Its totient is φ = 630472524.

The previous prime is 630656249. The next prime is 630656263. The reversal of 630656261 is 162656036.

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 630656261 - 2⁶ = 630656197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (630656263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86621 + ... + 93618.

It is an arithmetic number, because the mean of its divisors is an integer number (157710000).

Almost surely, 2^630656261 is an apocalyptic number.

It is an amenable number.

630656261 is a deficient number, since it is larger than the sum of its proper divisors (183739).

630656261 is a wasteful number, since it uses less digits than its factorization.

630656261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183738.

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 630656261 is about 25112.8704253417. The cubic root of 630656261 is about 857.5594503006.

The spelling of 630656261 in words is "six hundred thirty million, six hundred fifty-six thousand, two hundred sixty-one".