100631939 has 4 divisors (see below), whose sum is σ = 101844456. Its totient is φ = 99419424.

The previous prime is 100631933. The next prime is 100631941. The reversal of 100631939 is 939136001.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100631939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100631933) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 606134 + ... + 606299.

It is an arithmetic number, because the mean of its divisors is an integer number (25461114).

Almost surely, 2^100631939 is an apocalyptic number.

100631939 is a deficient number, since it is larger than the sum of its proper divisors (1212517).

100631939 is an equidigital number, since it uses as much as digits as its factorization.

100631939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1212516.

The product of its (nonzero) digits is 4374, while the sum is 32.

The square root of 100631939 is about 10031.5471887441. The cubic root of 100631939 is about 465.1345646701.

The spelling of 100631939 in words is "one hundred million, six hundred thirty-one thousand, nine hundred thirty-nine".