2157257 has 2 divisors, whose sum is σ = 2157258. Its totient is φ = 2157256.

The previous prime is 2157251. The next prime is 2157269. The reversal of 2157257 is 7527512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1290496 + 866761 = 1136^2 + 931^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2157257 is a prime.

It is not a weakly prime, because it can be changed into another prime (2157251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078628 + 1078629.

It is an arithmetic number, because the mean of its divisors is an integer number (1078629).

2^2157257 is an apocalyptic number.

It is an amenable number.

2157257 is a deficient number, since it is larger than the sum of its proper divisors (1).

2157257 is an equidigital number, since it uses as much as digits as its factorization.

2157257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4900, while the sum is 29.

The square root of 2157257 is about 1468.7603616656. The cubic root of 2157257 is about 129.2113395716.

The spelling of 2157257 in words is "two million, one hundred fifty-seven thousand, two hundred fifty-seven".