102991169 has 4 divisors (see below), whose sum is σ = 103524996. Its totient is φ = 102457344.

The previous prime is 102991121. The next prime is 102991177. The reversal of 102991169 is 961199201.

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

It can be written as a sum of positive squares in 2 ways, for example, as 14348944 + 88642225 = 3788^2 + 9415^2 .

It is a cyclic number.

It is not a de Polignac number, because 102991169 - 2²⁰ = 101942593 is a prime.

It is a super-2 number, since 2×102991169² = 21214361783973122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (102991199) 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, 266624 + ... + 267009.

It is an arithmetic number, because the mean of its divisors is an integer number (25881249).

Almost surely, 2^102991169 is an apocalyptic number.

It is an amenable number.

102991169 is a deficient number, since it is larger than the sum of its proper divisors (533827).

102991169 is an equidigital number, since it uses as much as digits as its factorization.

102991169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 533826.

The product of its (nonzero) digits is 8748, while the sum is 38.

The square root of 102991169 is about 10148.4564836235. The cubic root of 102991169 is about 468.7414177036.

The spelling of 102991169 in words is "one hundred two million, nine hundred ninety-one thousand, one hundred sixty-nine".