2128157 has 2 divisors, whose sum is σ = 2128158. Its totient is φ = 2128156.

The previous prime is 2128153. The next prime is 2128177. The reversal of 2128157 is 7518212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1976836 + 151321 = 1406^2 + 389^2 .

It is a cyclic number.

It is not a de Polignac number, because 2128157 - 2² = 2128153 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2128153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1064078 + 1064079.

It is an arithmetic number, because the mean of its divisors is an integer number (1064079).

2^2128157 is an apocalyptic number.

It is an amenable number.

2128157 is a deficient number, since it is larger than the sum of its proper divisors (1).

2128157 is an equidigital number, since it uses as much as digits as its factorization.

2128157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1120, while the sum is 26.

The square root of 2128157 is about 1458.8204138961. The cubic root of 2128157 is about 128.6277149789.

The spelling of 2128157 in words is "two million, one hundred twenty-eight thousand, one hundred fifty-seven".