631301081 has 8 divisors (see below), whose sum is σ = 652374528. Its totient is φ = 610907700.

The previous prime is 631301057. The next prime is 631301093. The reversal of 631301081 is 180103136.

631301081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-631301081 is a prime.

It is a super-2 number, since 2×631301081² = 797082109743537122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631301051) 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, 19196 + ... + 40386.

It is an arithmetic number, because the mean of its divisors is an integer number (81546816).

Almost surely, 2^631301081 is an apocalyptic number.

It is an amenable number.

631301081 is a deficient number, since it is larger than the sum of its proper divisors (21073447).

631301081 is an frugal number, since it uses more digits than its factorization.

631301081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21284 (or 21222 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 631301081 is about 25125.7055821324. The cubic root of 631301081 is about 857.8516237937.

The spelling of 631301081 in words is "six hundred thirty-one million, three hundred one thousand, eighty-one".