631147081 has 8 divisors (see below), whose sum is σ = 642062664. Its totient is φ = 620323200.

The previous prime is 631147079. The next prime is 631147093. The reversal of 631147081 is 180741136.

It can be written as a sum of positive squares in 4 ways, for example, as 104857600 + 526289481 = 10240^2 + 22941^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 631147081 - 2¹ = 631147079 is a prime.

It is a super-2 number, since 2×631147081² = 796693275709641122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (631147001) 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, 8970 + ... + 36643.

It is an arithmetic number, because the mean of its divisors is an integer number (80257833).

Almost surely, 2^631147081 is an apocalyptic number.

It is an amenable number.

631147081 is a deficient number, since it is larger than the sum of its proper divisors (10915583).

631147081 is a wasteful number, since it uses less digits than its factorization.

631147081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45851.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 631147081 is about 25122.6408046606. The cubic root of 631147081 is about 857.7818631582.

The spelling of 631147081 in words is "six hundred thirty-one million, one hundred forty-seven thousand, eighty-one".