2157157 has 2 divisors, whose sum is σ = 2157158. Its totient is φ = 2157156.

The previous prime is 2157151. The next prime is 2157163. The reversal of 2157157 is 7517512.

It is a balanced prime because it is at equal distance from previous prime (2157151) and next prime (2157163).

It can be written as a sum of positive squares in only one way, i.e., 2070721 + 86436 = 1439^2 + 294^2 .

It is a cyclic number.

It is not a de Polignac number, because 2157157 - 2³ = 2157149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2157151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078578 + 1078579.

It is an arithmetic number, because the mean of its divisors is an integer number (1078579).

2^2157157 is an apocalyptic number.

It is an amenable number.

2157157 is a deficient number, since it is larger than the sum of its proper divisors (1).

2157157 is an equidigital number, since it uses as much as digits as its factorization.

2157157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2450, while the sum is 28.

The square root of 2157157 is about 1468.7263189580. The cubic root of 2157157 is about 129.2093430032.

The spelling of 2157157 in words is "two million, one hundred fifty-seven thousand, one hundred fifty-seven".