2391538465 has 4 divisors (see below), whose sum is σ = 2869846164. Its totient is φ = 1913230768.

The previous prime is 2391538423. The next prime is 2391538469. The reversal of 2391538465 is 5648351932.

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 382437136 + 2009101329 = 19556^2 + 44823^2 .

It is a cyclic number.

It is not a de Polignac number, because 2391538465 - 2¹⁹ = 2391014177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2391538469) 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, 239153842 + ... + 239153851.

It is an arithmetic number, because the mean of its divisors is an integer number (717461541).

Almost surely, 2^2391538465 is an apocalyptic number.

It is an amenable number.

2391538465 is a deficient number, since it is larger than the sum of its proper divisors (478307699).

2391538465 is an equidigital number, since it uses as much as digits as its factorization.

2391538465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478307698.

The product of its digits is 777600, while the sum is 46.

The square root of 2391538465 is about 48903.3584225051. The cubic root of 2391538465 is about 1337.2905945199.

The spelling of 2391538465 in words is "two billion, three hundred ninety-one million, five hundred thirty-eight thousand, four hundred sixty-five".