100091965 has 4 divisors (see below), whose sum is σ = 120110364. Its totient is φ = 80073568.

The previous prime is 100091899. The next prime is 100091969. The reversal of 100091965 is 569190001.

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 68079001 + 32012964 = 8251^2 + 5658^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100091965 is a prime.

It is a super-2 number, since 2×100091965² = 20036802915122450, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100091969) 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, 10009192 + ... + 10009201.

It is an arithmetic number, because the mean of its divisors is an integer number (30027591).

Almost surely, 2^100091965 is an apocalyptic number.

It is an amenable number.

100091965 is a deficient number, since it is larger than the sum of its proper divisors (20018399).

100091965 is an equidigital number, since it uses as much as digits as its factorization.

100091965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20018398.

The product of its (nonzero) digits is 2430, while the sum is 31.

The square root of 100091965 is about 10004.5971932907. The cubic root of 100091965 is about 464.3011276709.

The spelling of 100091965 in words is "one hundred million, ninety-one thousand, nine hundred sixty-five".