2151723843 has 24 divisors (see below), whose sum is σ = 3124386720. Its totient is φ = 1426965120.

The previous prime is 2151723841. The next prime is 2151723859. The reversal of 2151723843 is 3483271512.

It is not a de Polignac number, because 2151723843 - 2¹ = 2151723841 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2151723798 and 2151723807.

It is not an unprimeable number, because it can be changed into a prime (2151723841) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1905303 + ... + 1906431.

It is an arithmetic number, because the mean of its divisors is an integer number (130182780).

Almost surely, 2^2151723843 is an apocalyptic number.

2151723843 is a deficient number, since it is larger than the sum of its proper divisors (972662877).

2151723843 is a wasteful number, since it uses less digits than its factorization.

2151723843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2059 (or 2056 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 2151723843 is about 46386.6774300553. The cubic root of 2151723843 is about 1291.0077342871.

The spelling of 2151723843 in words is "two billion, one hundred fifty-one million, seven hundred twenty-three thousand, eight hundred forty-three".