2157457 has 2 divisors, whose sum is σ = 2157458. Its totient is φ = 2157456.

The previous prime is 2157451. The next prime is 2157481. The reversal of 2157457 is 7547512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2143296 + 14161 = 1464^2 + 119^2 .

It is a cyclic number.

It is not a de Polignac number, because 2157457 - 2⁷ = 2157329 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 (2157451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078728 + 1078729.

It is an arithmetic number, because the mean of its divisors is an integer number (1078729).

2^2157457 is an apocalyptic number.

It is an amenable number.

2157457 is a deficient number, since it is larger than the sum of its proper divisors (1).

2157457 is an equidigital number, since it uses as much as digits as its factorization.

2157457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9800, while the sum is 31.

The square root of 2157457 is about 1468.8284447137. The cubic root of 2157457 is about 129.2153325233.

The spelling of 2157457 in words is "two million, one hundred fifty-seven thousand, four hundred fifty-seven".