90909191001 has 4 divisors (see below), whose sum is σ = 121212254672. Its totient is φ = 60606127332.

The previous prime is 90909190943. The next prime is 90909191003. The reversal of 90909191001 is 10019190909.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 90909191001 - 2⁷ = 90909190873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90909191003) 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, 15151531831 + ... + 15151531836.

It is an arithmetic number, because the mean of its divisors is an integer number (30303063668).

Almost surely, 2^90909191001 is an apocalyptic number.

It is an amenable number.

90909191001 is a deficient number, since it is larger than the sum of its proper divisors (30303063671).

90909191001 is a wasteful number, since it uses less digits than its factorization.

90909191001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30303063670.

The product of its (nonzero) digits is 6561, while the sum is 39.

The spelling of 90909191001 in words is "ninety billion, nine hundred nine million, one hundred ninety-one thousand, one".