104991813 has 24 divisors (see below), whose sum is σ = 161336448. Its totient is φ = 65565312.

The previous prime is 104991791. The next prime is 104991827. The reversal of 104991813 is 318199401.

It is not a de Polignac number, because 104991813 - 2¹⁷ = 104860741 is a prime.

It is a super-2 number, since 2×104991813² = 22046561594053938, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (104991833) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33220 + ... + 36242.

It is an arithmetic number, because the mean of its divisors is an integer number (6722352).

Almost surely, 2^104991813 is an apocalyptic number.

It is an amenable number.

104991813 is a deficient number, since it is larger than the sum of its proper divisors (56344635).

104991813 is a wasteful number, since it uses less digits than its factorization.

104991813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3273 (or 3270 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The square root of 104991813 is about 10246.5512734773. The cubic root of 104991813 is about 471.7571362017.

The spelling of 104991813 in words is "one hundred four million, nine hundred ninety-one thousand, eight hundred thirteen".