2391157641 has 4 divisors (see below), whose sum is σ = 3188210192. Its totient is φ = 1594105092.

The previous prime is 2391157591. The next prime is 2391157649. The reversal of 2391157641 is 1467511932.

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 not a de Polignac number, because 2391157641 - 2¹⁰ = 2391156617 is a prime.

It is a super-2 number, since 2×2391157641² = 11435269728225369762, which contains 22 as substring.

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 2391157641.

It is not an unprimeable number, because it can be changed into a prime (2391157649) 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, 398526271 + ... + 398526276.

It is an arithmetic number, because the mean of its divisors is an integer number (797052548).

Almost surely, 2^2391157641 is an apocalyptic number.

It is an amenable number.

2391157641 is a deficient number, since it is larger than the sum of its proper divisors (797052551).

2391157641 is an equidigital number, since it uses as much as digits as its factorization.

2391157641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 797052550.

The product of its digits is 45360, while the sum is 39.

The square root of 2391157641 is about 48899.4646289711. The cubic root of 2391157641 is about 1337.2196082217.

The spelling of 2391157641 in words is "two billion, three hundred ninety-one million, one hundred fifty-seven thousand, six hundred forty-one".