2178257 has 2 divisors, whose sum is σ = 2178258. Its totient is φ = 2178256.

The previous prime is 2178223. The next prime is 2178259. The reversal of 2178257 is 7528712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1948816 + 229441 = 1396^2 + 479^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2178257 is a prime.

Together with 2178259, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2178259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1089128 + 1089129.

It is an arithmetic number, because the mean of its divisors is an integer number (1089129).

2^2178257 is an apocalyptic number.

It is an amenable number.

2178257 is a deficient number, since it is larger than the sum of its proper divisors (1).

2178257 is an equidigital number, since it uses as much as digits as its factorization.

2178257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7840, while the sum is 32.

The square root of 2178257 is about 1475.8919337133. The cubic root of 2178257 is about 129.6292592894.

The spelling of 2178257 in words is "two million, one hundred seventy-eight thousand, two hundred fifty-seven".