631578101 has 24 divisors (see below), whose sum is σ = 848641536. Its totient is φ = 463182720.

The previous prime is 631578047. The next prime is 631578127. The reversal of 631578101 is 101875136.

It is a de Polignac number, because none of the positive numbers 2^k-631578101 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 (631578161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25301 + ... + 43626.

It is an arithmetic number, because the mean of its divisors is an integer number (35360064).

Almost surely, 2^631578101 is an apocalyptic number.

It is an amenable number.

631578101 is a deficient number, since it is larger than the sum of its proper divisors (217063435).

631578101 is a wasteful number, since it uses less digits than its factorization.

631578101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68969 (or 68962 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 631578101 is about 25131.2176585218. The cubic root of 631578101 is about 857.9770828457.

The spelling of 631578101 in words is "six hundred thirty-one million, five hundred seventy-eight thousand, one hundred one".