2891157 has 4 divisors (see below), whose sum is σ = 3854880. Its totient is φ = 1927436.

The previous prime is 2891137. The next prime is 2891171. The reversal of 2891157 is 7511982.

2891157 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2891157 - 2⁶ = 2891093 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2891137) 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 3 ways as a sum of consecutive naturals, for example, 481857 + ... + 481862.

It is an arithmetic number, because the mean of its divisors is an integer number (963720).

2^2891157 is an apocalyptic number.

It is an amenable number.

2891157 is a deficient number, since it is larger than the sum of its proper divisors (963723).

2891157 is an equidigital number, since it uses as much as digits as its factorization.

2891157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 963722.

The product of its digits is 5040, while the sum is 33.

The square root of 2891157 is about 1700.3402600656. The cubic root of 2891157 is about 142.4592188627.

The spelling of 2891157 in words is "two million, eight hundred ninety-one thousand, one hundred fifty-seven".