100031491 has 16 divisors (see below), whose sum is σ = 118656000. Its totient is φ = 84270984.

The previous prime is 100031483. The next prime is 100031501. The reversal of 100031491 is 194130001.

It is a happy number.

It is not a de Polignac number, because 100031491 - 2³ = 100031483 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100031471) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17766 + ... + 22708.

It is an arithmetic number, because the mean of its divisors is an integer number (7416000).

Almost surely, 2^100031491 is an apocalyptic number.

100031491 is a deficient number, since it is larger than the sum of its proper divisors (18624509).

100031491 is an frugal number, since it uses more digits than its factorization.

100031491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5023 (or 5009 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 100031491 is about 10001.5744260591. The cubic root of 100031491 is about 464.2076010057.

Adding to 100031491 its reverse (194130001), we get a palindrome (294161492).

It can be divided in two parts, 1000314 and 91, that added together give a triangular number (1000405 = T₁₄₁₄).

The spelling of 100031491 in words is "one hundred million, thirty-one thousand, four hundred ninety-one".