100312031 has 4 divisors (see below), whose sum is σ = 100347864. Its totient is φ = 100276200.

The previous prime is 100312007. The next prime is 100312033. The reversal of 100312031 is 130213001.

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

It is a cyclic number.

It is not a de Polignac number, because 100312031 - 2¹⁰ = 100311007 is a prime.

It is a super-2 number, since 2×100312031² = 20125007126689922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100312033) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 13325 + ... + 19446.

It is an arithmetic number, because the mean of its divisors is an integer number (25086966).

Almost surely, 2^100312031 is an apocalyptic number.

100312031 is a deficient number, since it is larger than the sum of its proper divisors (35833).

100312031 is an equidigital number, since it uses as much as digits as its factorization.

100312031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35832.

The product of its (nonzero) digits is 18, while the sum is 11.

The square root of 100312031 is about 10015.5893985327. The cubic root of 100312031 is about 464.6411552977.

Adding to 100312031 its reverse (130213001), we get a palindrome (230525032).

The spelling of 100312031 in words is "one hundred million, three hundred twelve thousand, thirty-one".