631328919 has 16 divisors (see below), whose sum is σ = 935768064. Its totient is φ = 375976800.

The previous prime is 631328911. The next prime is 631328923. The reversal of 631328919 is 919823136.

It is not a de Polignac number, because 631328919 - 2³ = 631328911 is a prime.

It is a super-2 number, since 2×631328919² = 797152407931417122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631328911) 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 15 ways as a sum of consecutive naturals, for example, 259887 + ... + 262304.

It is an arithmetic number, because the mean of its divisors is an integer number (58485504).

Almost surely, 2^631328919 is an apocalyptic number.

631328919 is a deficient number, since it is larger than the sum of its proper divisors (304439145).

631328919 is a wasteful number, since it uses less digits than its factorization.

631328919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 522238.

The product of its digits is 69984, while the sum is 42.

The square root of 631328919 is about 25126.2595505181. The cubic root of 631328919 is about 857.8642329502.

The spelling of 631328919 in words is "six hundred thirty-one million, three hundred twenty-eight thousand, nine hundred nineteen".