631329081 has 8 divisors (see below), whose sum is σ = 841967040. Its totient is φ = 420788592.

The previous prime is 631329031. The next prime is 631329107. The reversal of 631329081 is 180923136.

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

It is not a de Polignac number, because 631329081 - 2²¹ = 629231929 is a prime.

It is a super-2 number, since 2×631329081² = 797152817032609122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (631329011) 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 7 ways as a sum of consecutive naturals, for example, 7605 + ... + 36338.

It is an arithmetic number, because the mean of its divisors is an integer number (105245880).

Almost surely, 2^631329081 is an apocalyptic number.

It is an amenable number.

631329081 is a deficient number, since it is larger than the sum of its proper divisors (210637959).

631329081 is a wasteful number, since it uses less digits than its factorization.

631329081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48735.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 631329081 is about 25126.2627742368. The cubic root of 631329081 is about 857.8643063267.

The spelling of 631329081 in words is "six hundred thirty-one million, three hundred twenty-nine thousand, eighty-one".