2151885 has 16 divisors (see below), whose sum is σ = 3528000. Its totient is φ = 1119360.

The previous prime is 2151869. The next prime is 2151899. The reversal of 2151885 is 5881512.

2151885 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2151885 - 2⁴ = 2151869 is a prime.

It is an Ulam number.

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 15 ways as a sum of consecutive naturals, for example, 1135 + ... + 2364.

It is an arithmetic number, because the mean of its divisors is an integer number (220500).

2^2151885 is an apocalyptic number.

It is an amenable number.

2151885 is a deficient number, since it is larger than the sum of its proper divisors (1376115).

2151885 is a wasteful number, since it uses less digits than its factorization.

2151885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3548.

The product of its digits is 3200, while the sum is 30.

The square root of 2151885 is about 1466.9304686999. The cubic root of 2151885 is about 129.1039964219.

The spelling of 2151885 in words is "two million, one hundred fifty-one thousand, eight hundred eighty-five".