104990891 has 2 divisors, whose sum is σ = 104990892. Its totient is φ = 104990890.

The previous prime is 104990849. The next prime is 104990911. The reversal of 104990891 is 198099401.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 104990891 - 2¹⁰ = 104989867 is a prime.

It is a super-2 number, since 2×104990891² = 22046174385947762, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (104990591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52495445 + 52495446.

It is an arithmetic number, because the mean of its divisors is an integer number (52495446).

Almost surely, 2^104990891 is an apocalyptic number.

104990891 is a deficient number, since it is larger than the sum of its proper divisors (1).

104990891 is an equidigital number, since it uses as much as digits as its factorization.

104990891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 41.

The square root of 104990891 is about 10246.5062826312. The cubic root of 104990891 is about 471.7557552643.

The spelling of 104990891 in words is "one hundred four million, nine hundred ninety thousand, eight hundred ninety-one".