1931163640 has 64 divisors (see below), whose sum is σ = 4971663360. Its totient is φ = 661338240.

The previous prime is 1931163623. The next prime is 1931163709. The reversal of 1931163640 is 463611391.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1931163596 and 1931163605.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 268329 + ... + 275431.

It is an arithmetic number, because the mean of its divisors is an integer number (77682240).

Almost surely, 2^1931163640 is an apocalyptic number.

1931163640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1931163640 is an abundant number, since it is smaller than the sum of its proper divisors (3040499720).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1931163640 is a wasteful number, since it uses less digits than its factorization.

1931163640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8092 (or 8088 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 1931163640 is about 43945.0069973825. The cubic root of 1931163640 is about 1245.2972392880.

The spelling of 1931163640 in words is "one billion, nine hundred thirty-one million, one hundred sixty-three thousand, six hundred forty".