2523009991 has 4 divisors (see below), whose sum is σ = 2523319552. Its totient is φ = 2522700432.

The previous prime is 2523009949. The next prime is 2523010109. The reversal of 2523009991 is 1999003252.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2523009991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2523099991) 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, 142215 + ... + 158968.

It is an arithmetic number, because the mean of its divisors is an integer number (630829888).

Almost surely, 2^2523009991 is an apocalyptic number.

2523009991 is a deficient number, since it is larger than the sum of its proper divisors (309561).

2523009991 is an equidigital number, since it uses as much as digits as its factorization.

2523009991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309560.

The product of its (nonzero) digits is 43740, while the sum is 40.

The square root of 2523009991 is about 50229.5728729600. The cubic root of 2523009991 is about 1361.3600133305.

The spelling of 2523009991 in words is "two billion, five hundred twenty-three million, nine thousand, nine hundred ninety-one".