2391347845 has 4 divisors (see below), whose sum is σ = 2869617420. Its totient is φ = 1913078272.

The previous prime is 2391347831. The next prime is 2391347867. The reversal of 2391347845 is 5487431932.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1193218849 + 1198128996 = 34543^2 + 34614^2 .

It is a cyclic number.

It is not a de Polignac number, because 2391347845 - 2⁵ = 2391347813 is a prime.

It is a super-2 number, since 2×2391347845² = 11437089031572288050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2391347795 and 2391347804.

It is a congruent number.

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, 239134780 + ... + 239134789.

It is an arithmetic number, because the mean of its divisors is an integer number (717404355).

Almost surely, 2^2391347845 is an apocalyptic number.

It is an amenable number.

2391347845 is a deficient number, since it is larger than the sum of its proper divisors (478269575).

2391347845 is an equidigital number, since it uses as much as digits as its factorization.

2391347845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478269574.

The product of its digits is 725760, while the sum is 46.

The square root of 2391347845 is about 48901.4094377657. The cubic root of 2391347845 is about 1337.2550635413.

The spelling of 2391347845 in words is "two billion, three hundred ninety-one million, three hundred forty-seven thousand, eight hundred forty-five".