1225657 has 2 divisors, whose sum is σ = 1225658. Its totient is φ = 1225656.

The previous prime is 1225643. The next prime is 1225663. The reversal of 1225657 is 7565221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1212201 + 13456 = 1101^2 + 116^2 .

It is a cyclic number.

It is not a de Polignac number, because 1225657 - 2⁷ = 1225529 is a prime.

It is a Chen prime.

1225657 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1225687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612828 + 612829.

It is an arithmetic number, because the mean of its divisors is an integer number (612829).

2^1225657 is an apocalyptic number.

It is an amenable number.

1225657 is a deficient number, since it is larger than the sum of its proper divisors (1).

1225657 is an equidigital number, since it uses as much as digits as its factorization.

1225657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4200, while the sum is 28.

The square root of 1225657 is about 1107.0939436200. The cubic root of 1225657 is about 107.0178733935.

The spelling of 1225657 in words is "one million, two hundred twenty-five thousand, six hundred fifty-seven".