2150781 has 16 divisors (see below), whose sum is σ = 3057600. Its totient is φ = 1340928.

The previous prime is 2150777. The next prime is 2150783. The reversal of 2150781 is 1870512.

2150781 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 2150781 - 2² = 2150777 is a prime.

It is a super-2 number, since 2×2150781² = 9251717819922, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2150783) 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 in 15 ways as a sum of consecutive naturals, for example, 5335 + ... + 5723.

It is an arithmetic number, because the mean of its divisors is an integer number (191100).

2^2150781 is an apocalyptic number.

It is an amenable number.

2150781 is a deficient number, since it is larger than the sum of its proper divisors (906819).

2150781 is a wasteful number, since it uses less digits than its factorization.

2150781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 508.

The product of its (nonzero) digits is 560, while the sum is 24.

The square root of 2150781 is about 1466.5541244700. The cubic root of 2150781 is about 129.0819142020.

The spelling of 2150781 in words is "two million, one hundred fifty thousand, seven hundred eighty-one".