2153891 has 2 divisors, whose sum is σ = 2153892. Its totient is φ = 2153890.

The previous prime is 2153887. The next prime is 2153903. The reversal of 2153891 is 1983512.

2153891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2153891 - 2² = 2153887 is a prime.

It is not a weakly prime, because it can be changed into another prime (2153861) by changing a digit.

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 as a sum of consecutive naturals, namely, 1076945 + 1076946.

It is an arithmetic number, because the mean of its divisors is an integer number (1076946).

2^2153891 is an apocalyptic number.

2153891 is a deficient number, since it is larger than the sum of its proper divisors (1).

2153891 is an equidigital number, since it uses as much as digits as its factorization.

2153891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 29.

The square root of 2153891 is about 1467.6140500827. The cubic root of 2153891 is about 129.1441011337.

The spelling of 2153891 in words is "two million, one hundred fifty-three thousand, eight hundred ninety-one".