90919292091 has 4 divisors (see below), whose sum is σ = 121225722792. Its totient is φ = 60612861392.

The previous prime is 90919292071. The next prime is 90919292131. The reversal of 90919292091 is 19029291909.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19029291909 = 3 ⋅6343097303.

It is a cyclic number.

It is not a de Polignac number, because 90919292091 - 2¹³ = 90919283899 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90919292021) 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, 15153215346 + ... + 15153215351.

It is an arithmetic number, because the mean of its divisors is an integer number (30306430698).

Almost surely, 2^90919292091 is an apocalyptic number.

90919292091 is a deficient number, since it is larger than the sum of its proper divisors (30306430701).

90919292091 is a wasteful number, since it uses less digits than its factorization.

90919292091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30306430700.

The product of its (nonzero) digits is 236196, while the sum is 51.

The spelling of 90919292091 in words is "ninety billion, nine hundred nineteen million, two hundred ninety-two thousand, ninety-one".