90919201091 has 4 divisors (see below), whose sum is σ = 91316228400. Its totient is φ = 90522173784.

The previous prime is 90919201081. The next prime is 90919201111. The reversal of 90919201091 is 19010291909.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90919201091 is a prime.

It is a super-2 number, since 2×90919201091² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90919201001) 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, 198513311 + ... + 198513768.

It is an arithmetic number, because the mean of its divisors is an integer number (22829057100).

Almost surely, 2^90919201091 is an apocalyptic number.

90919201091 is a deficient number, since it is larger than the sum of its proper divisors (397027309).

90919201091 is a wasteful number, since it uses less digits than its factorization.

90919201091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397027308.

The product of its (nonzero) digits is 13122, while the sum is 41.

The spelling of 90919201091 in words is "ninety billion, nine hundred nineteen million, two hundred one thousand, ninety-one".