90909091001 has 8 divisors (see below), whose sum is σ = 93055427520. Its totient is φ = 88764216912.

The previous prime is 90909090977. The next prime is 90909091027. The reversal of 90909091001 is 10019090909.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 90909091001 - 2¹⁰ = 90909089977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90909091601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 239306 + ... + 488963.

It is an arithmetic number, because the mean of its divisors is an integer number (11631928440).

Almost surely, 2^90909091001 is an apocalyptic number.

It is an amenable number.

90909091001 is a deficient number, since it is larger than the sum of its proper divisors (2146336519).

90909091001 is a wasteful number, since it uses less digits than its factorization.

90909091001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 731215.

The product of its (nonzero) digits is 6561, while the sum is 38.

It can be divided in two parts, 9090909 and 1001, that multiplied together give a palindrome (9099999909).

The spelling of 90909091001 in words is "ninety billion, nine hundred nine million, ninety-one thousand, one".