2597689091 has 4 divisors (see below), whose sum is σ = 2598435000. Its totient is φ = 2596943184.

The previous prime is 2597689057. The next prime is 2597689099. The reversal of 2597689091 is 1909867952.

2597689091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 2597689091 - 2⁶ = 2597689027 is a prime.

It is a super-2 number, since 2×2597689091² = 13495977227000812562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2597689099) 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, 367706 + ... + 374703.

It is an arithmetic number, because the mean of its divisors is an integer number (649608750).

Almost surely, 2^2597689091 is an apocalyptic number.

2597689091 is a deficient number, since it is larger than the sum of its proper divisors (745909).

2597689091 is an equidigital number, since it uses as much as digits as its factorization.

2597689091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745908.

The product of its (nonzero) digits is 2449440, while the sum is 56.

The square root of 2597689091 is about 50967.5297714143. The cubic root of 2597689091 is about 1374.6613541341.

The spelling of 2597689091 in words is "two billion, five hundred ninety-seven million, six hundred eighty-nine thousand, ninety-one".