2157291 has 6 divisors (see below), whose sum is σ = 3116100. Its totient is φ = 1438188.

The previous prime is 2157277. The next prime is 2157293. The reversal of 2157291 is 1927512.

2157291 is a `hidden beast` number, since 2 + 1 + 572 + 91 = 666.

It is not a de Polignac number, because 2157291 - 2⁷ = 2157163 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2157293) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 119841 + ... + 119858.

It is an arithmetic number, because the mean of its divisors is an integer number (519350).

2^2157291 is an apocalyptic number.

2157291 is a deficient number, since it is larger than the sum of its proper divisors (958809).

2157291 is a wasteful number, since it uses less digits than its factorization.

2157291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239705 (or 239702 counting only the distinct ones).

The product of its digits is 1260, while the sum is 27.

The square root of 2157291 is about 1468.7719360064. The cubic root of 2157291 is about 129.2120183908.

The spelling of 2157291 in words is "two million, one hundred fifty-seven thousand, two hundred ninety-one".