902001091 has 4 divisors (see below), whose sum is σ = 902624184. Its totient is φ = 901378000.

The previous prime is 902001073. The next prime is 902001103. The reversal of 902001091 is 190100209.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 190100209 = 13 ⋅14623093.

It is a cyclic number.

It is not a de Polignac number, because 902001091 - 2²³ = 893612483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (902001031) 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, 309370 + ... + 312271.

It is an arithmetic number, because the mean of its divisors is an integer number (225656046).

Almost surely, 2^902001091 is an apocalyptic number.

902001091 is a deficient number, since it is larger than the sum of its proper divisors (623093).

902001091 is a wasteful number, since it uses less digits than its factorization.

902001091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 623092.

The product of its (nonzero) digits is 162, while the sum is 22.

The square root of 902001091 is about 30033.3329985202. The cubic root of 902001091 is about 966.2044223718.

The spelling of 902001091 in words is "nine hundred two million, one thousand, ninety-one".