109891369 has 20 divisors (see below), whose sum is σ = 131770244. Its totient is φ = 91572768.

The previous prime is 109891361. The next prime is 109891387. The reversal of 109891369 is 963198901.

It can be written as a sum of positive squares in 2 ways, for example, as 91298025 + 18593344 = 9555^2 + 4312^2 .

It is not a de Polignac number, because 109891369 - 2³ = 109891361 is a prime.

It is a super-2 number, since 2×109891369² = 24152225961388322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (109891361) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 88219 + ... + 89455.

Almost surely, 2^109891369 is an apocalyptic number.

It is an amenable number.

109891369 is a deficient number, since it is larger than the sum of its proper divisors (21878875).

109891369 is an frugal number, since it uses more digits than its factorization.

109891369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1302 (or 1281 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 46.

The square root of 109891369 is about 10482.9084227613. The cubic root of 109891369 is about 478.9842074747.

The spelling of 109891369 in words is "one hundred nine million, eight hundred ninety-one thousand, three hundred sixty-nine".