2151993895 has 4 divisors (see below), whose sum is σ = 2582392680. Its totient is φ = 1721595112.

The previous prime is 2151993881. The next prime is 2151993911. The reversal of 2151993895 is 5983991512.

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 2151993895 - 2⁹ = 2151993383 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 215199385 + ... + 215199394.

It is an arithmetic number, because the mean of its divisors is an integer number (645598170).

Almost surely, 2^2151993895 is an apocalyptic number.

2151993895 is a deficient number, since it is larger than the sum of its proper divisors (430398785).

2151993895 is an equidigital number, since it uses as much as digits as its factorization.

2151993895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430398784.

The product of its digits is 874800, while the sum is 52.

The square root of 2151993895 is about 46389.5882176162. The cubic root of 2151993895 is about 1291.0617413162.

The spelling of 2151993895 in words is "two billion, one hundred fifty-one million, nine hundred ninety-three thousand, eight hundred ninety-five".