163931013 has 8 divisors (see below), whose sum is σ = 242860800. Its totient is φ = 109287324.

The previous prime is 163931011. The next prime is 163931071. The reversal of 163931013 is 310139361.

163931013 is a `hidden beast` number, since 1 + 639 + 3 + 10 + 13 = 666.

It is not a de Polignac number, because 163931013 - 2¹ = 163931011 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 6071519 = 163931013 / (1 + 6 + 3 + 9 + 3 + 1 + 0 + 1 + 3).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163931011) 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, 3035733 + ... + 3035786.

It is an arithmetic number, because the mean of its divisors is an integer number (30357600).

Almost surely, 2^163931013 is an apocalyptic number.

It is an amenable number.

163931013 is a deficient number, since it is larger than the sum of its proper divisors (78929787).

163931013 is an equidigital number, since it uses as much as digits as its factorization.

163931013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6071528 (or 6071522 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 27.

The square root of 163931013 is about 12803.5547017225. The cubic root of 163931013 is about 547.2936058221.

The spelling of 163931013 in words is "one hundred sixty-three million, nine hundred thirty-one thousand, thirteen".