2891156 has 36 divisors (see below), whose sum is σ = 5595996. Its totient is φ = 1305600.

The previous prime is 2891137. The next prime is 2891171. The reversal of 2891156 is 6511982.

It can be written as a sum of positive squares in 6 ways, for example, as 234256 + 2656900 = 484^2 + 1630^2 .

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 47366 + ... + 47426.

2^2891156 is an apocalyptic number.

It is an amenable number.

2891156 is a deficient number, since it is larger than the sum of its proper divisors (2704840).

2891156 is a wasteful number, since it uses less digits than its factorization.

2891156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140 (or 121 counting only the distinct ones).

The product of its digits is 4320, while the sum is 32.

The square root of 2891156 is about 1700.3399660068. The cubic root of 2891156 is about 142.4592024380.

It can be divided in two parts, 289 and 1156, that multiplied together give a square (334084 = 578²).

The spelling of 2891156 in words is "two million, eight hundred ninety-one thousand, one hundred fifty-six".