2391787955 has 4 divisors (see below), whose sum is σ = 2870145552. Its totient is φ = 1913430360.

The previous prime is 2391787939. The next prime is 2391787991. The reversal of 2391787955 is 5597871932.

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

It is not a de Polignac number, because 2391787955 - 2⁴ = 2391787939 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2391787955.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 239178791 + ... + 239178800.

It is an arithmetic number, because the mean of its divisors is an integer number (717536388).

Almost surely, 2^2391787955 is an apocalyptic number.

2391787955 is a deficient number, since it is larger than the sum of its proper divisors (478357597).

2391787955 is an equidigital number, since it uses as much as digits as its factorization.

2391787955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478357596.

The product of its digits is 4762800, while the sum is 56.

The square root of 2391787955 is about 48905.9092032854. The cubic root of 2391787955 is about 1337.3370958319.

The spelling of 2391787955 in words is "two billion, three hundred ninety-one million, seven hundred eighty-seven thousand, nine hundred fifty-five".