920910091 has 4 divisors (see below), whose sum is σ = 920997792. Its totient is φ = 920822392.

The previous prime is 920910079. The next prime is 920910097. The reversal of 920910091 is 190019029.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 190019029 = 2069 ⋅91841.

It is a cyclic number.

It is not a de Polignac number, because 920910091 - 2²⁹ = 384039179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (920910097) 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, 25555 + ... + 49948.

It is an arithmetic number, because the mean of its divisors is an integer number (230249448).

Almost surely, 2^920910091 is an apocalyptic number.

920910091 is a deficient number, since it is larger than the sum of its proper divisors (87701).

920910091 is a wasteful number, since it uses less digits than its factorization.

920910091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87700.

The product of its (nonzero) digits is 1458, while the sum is 31.

The square root of 920910091 is about 30346.5004736955. The cubic root of 920910091 is about 972.9094249969.

The spelling of 920910091 in words is "nine hundred twenty million, nine hundred ten thousand, ninety-one".