100097991 has 16 divisors (see below), whose sum is σ = 169478400. Its totient is φ = 57198744.

The previous prime is 100097983. The next prime is 100098007. The reversal of 100097991 is 199790001.

It is not a de Polignac number, because 100097991 - 2³ = 100097983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100097951) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 264621 + ... + 264998.

It is an arithmetic number, because the mean of its divisors is an integer number (10592400).

Almost surely, 2^100097991 is an apocalyptic number.

100097991 is a deficient number, since it is larger than the sum of its proper divisors (69380409).

100097991 is an equidigital number, since it uses as much as digits as its factorization.

100097991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529635 (or 529629 counting only the distinct ones).

The product of its (nonzero) digits is 5103, while the sum is 36.

The square root of 100097991 is about 10004.8983503082. The cubic root of 100097991 is about 464.3104451769.

The spelling of 100097991 in words is "one hundred million, ninety-seven thousand, nine hundred ninety-one".