2151591623 has 4 divisors (see below), whose sum is σ = 2178827040. Its totient is φ = 2124356208.

The previous prime is 2151591619. The next prime is 2151591641. The reversal of 2151591623 is 3261951512.

2151591623 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 2151591623 - 2² = 2151591619 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 (2151591023) 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, 13617590 + ... + 13617747.

It is an arithmetic number, because the mean of its divisors is an integer number (544706760).

Almost surely, 2^2151591623 is an apocalyptic number.

2151591623 is a deficient number, since it is larger than the sum of its proper divisors (27235417).

2151591623 is an equidigital number, since it uses as much as digits as its factorization.

2151591623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27235416.

The product of its digits is 16200, while the sum is 35.

The square root of 2151591623 is about 46385.2522144701. The cubic root of 2151591623 is about 1290.9812902898.

The spelling of 2151591623 in words is "two billion, one hundred fifty-one million, five hundred ninety-one thousand, six hundred twenty-three".