631613803261 has 32 divisors (see below), whose sum is σ = 798852464640. Its totient is φ = 486579177216.

The previous prime is 631613803253. The next prime is 631613803267. The reversal of 631613803261 is 162308316136.

It is a cyclic number.

It is not a de Polignac number, because 631613803261 - 2³ = 631613803253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631613803267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1471270 + ... + 1851448.

It is an arithmetic number, because the mean of its divisors is an integer number (24964139520).

Almost surely, 2^631613803261 is an apocalyptic number.

It is an amenable number.

631613803261 is a deficient number, since it is larger than the sum of its proper divisors (167238661379).

631613803261 is a wasteful number, since it uses less digits than its factorization.

631613803261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380833.

The product of its (nonzero) digits is 93312, while the sum is 40.

The spelling of 631613803261 in words is "six hundred thirty-one billion, six hundred thirteen million, eight hundred three thousand, two hundred sixty-one".