2291257 has 2 divisors, whose sum is σ = 2291258. Its totient is φ = 2291256.

The previous prime is 2291239. The next prime is 2291269. The reversal of 2291257 is 7521922.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2262016 + 29241 = 1504^2 + 171^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2291257 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2291227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1145628 + 1145629.

It is an arithmetic number, because the mean of its divisors is an integer number (1145629).

2^2291257 is an apocalyptic number.

It is an amenable number.

2291257 is a deficient number, since it is larger than the sum of its proper divisors (1).

2291257 is an equidigital number, since it uses as much as digits as its factorization.

2291257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2520, while the sum is 28.

The square root of 2291257 is about 1513.6898625544. The cubic root of 2291257 is about 131.8331416308.

The spelling of 2291257 in words is "two million, two hundred ninety-one thousand, two hundred fifty-seven".