2391797509 has 4 divisors (see below), whose sum is σ = 2392368640. Its totient is φ = 2391226380.

The previous prime is 2391797483. The next prime is 2391797521. The reversal of 2391797509 is 9057971932.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2391797509 - 2²⁹ = 1854926597 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 (2391797809) 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, 279237 + ... + 287674.

It is an arithmetic number, because the mean of its divisors is an integer number (598092160).

Almost surely, 2^2391797509 is an apocalyptic number.

It is an amenable number.

2391797509 is a deficient number, since it is larger than the sum of its proper divisors (571131).

2391797509 is an equidigital number, since it uses as much as digits as its factorization.

2391797509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571130.

The product of its (nonzero) digits is 1071630, while the sum is 52.

The square root of 2391797509 is about 48906.0068805459. The cubic root of 2391797509 is about 1337.3388764944.

The spelling of 2391797509 in words is "two billion, three hundred ninety-one million, seven hundred ninety-seven thousand, five hundred nine".