2117257 has 4 divisors (see below), whose sum is σ = 2122000. Its totient is φ = 2112516.

The previous prime is 2117239. The next prime is 2117273. The reversal of 2117257 is 7527112.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2117257 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2117237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1623 + ... + 2620.

It is an arithmetic number, because the mean of its divisors is an integer number (530500).

2^2117257 is an apocalyptic number.

It is an amenable number.

2117257 is a deficient number, since it is larger than the sum of its proper divisors (4743).

2117257 is an equidigital number, since it uses as much as digits as its factorization.

2117257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4742.

The product of its digits is 980, while the sum is 25.

The square root of 2117257 is about 1455.0797229018. The cubic root of 2117257 is about 128.4077370687.

The spelling of 2117257 in words is "two million, one hundred seventeen thousand, two hundred fifty-seven".