2151201823 has 4 divisors (see below), whose sum is σ = 2175372720. Its totient is φ = 2127030928.

The previous prime is 2151201809. The next prime is 2151201827. The reversal of 2151201823 is 3281021512.

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 2151201823 - 2¹⁷ = 2151070751 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 (2151201827) 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, 12085315 + ... + 12085492.

It is an arithmetic number, because the mean of its divisors is an integer number (543843180).

Almost surely, 2^2151201823 is an apocalyptic number.

2151201823 is a deficient number, since it is larger than the sum of its proper divisors (24170897).

2151201823 is an equidigital number, since it uses as much as digits as its factorization.

2151201823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24170896.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 2151201823 is about 46381.0502576214. The cubic root of 2151201823 is about 1290.9033239920.

The spelling of 2151201823 in words is "two billion, one hundred fifty-one million, two hundred one thousand, eight hundred twenty-three".