90909375922 has 4 divisors (see below), whose sum is σ = 136364063886. Its totient is φ = 45454687960.

The previous prime is 90909375901. The next prime is 90909375923. The reversal of 90909375922 is 22957390909.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22957390909 = 30203 ⋅760103.

It can be written as a sum of positive squares in only one way, i.e., 81395519401 + 9513856521 = 285299^2 + 97539^2 .

It is not an unprimeable number, because it can be changed into a prime (90909375923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22727343979 + ... + 22727343982.

Almost surely, 2^90909375922 is an apocalyptic number.

90909375922 is a deficient number, since it is larger than the sum of its proper divisors (45454687964).

90909375922 is a wasteful number, since it uses less digits than its factorization.

90909375922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45454687963.

The product of its (nonzero) digits is 2755620, while the sum is 55.

The spelling of 90909375922 in words is "ninety billion, nine hundred nine million, three hundred seventy-five thousand, nine hundred twenty-two".