2509971091 has 4 divisors (see below), whose sum is σ = 2511003472. Its totient is φ = 2508938712.

The previous prime is 2509971073. The next prime is 2509971143. The reversal of 2509971091 is 1901799052.

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 2509971091 - 2⁵ = 2509971059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2509971391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 512535 + ... + 517408.

It is an arithmetic number, because the mean of its divisors is an integer number (627750868).

Almost surely, 2^2509971091 is an apocalyptic number.

2509971091 is a deficient number, since it is larger than the sum of its proper divisors (1032381).

2509971091 is a wasteful number, since it uses less digits than its factorization.

2509971091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1032380.

The product of its (nonzero) digits is 51030, while the sum is 43.

The square root of 2509971091 is about 50099.6116851219. The cubic root of 2509971091 is about 1359.0107950512.

The spelling of 2509971091 in words is "two billion, five hundred nine million, nine hundred seventy-one thousand, ninety-one".