1662257 has 2 divisors, whose sum is σ = 1662258. Its totient is φ = 1662256.

The previous prime is 1662229. The next prime is 1662281. The reversal of 1662257 is 7522661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1201216 + 461041 = 1096^2 + 679^2 .

It is a cyclic number.

It is not a de Polignac number, because 1662257 - 2¹² = 1658161 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1662217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 831128 + 831129.

It is an arithmetic number, because the mean of its divisors is an integer number (831129).

2^1662257 is an apocalyptic number.

It is an amenable number.

1662257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1662257 is an equidigital number, since it uses as much as digits as its factorization.

1662257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5040, while the sum is 29.

The square root of 1662257 is about 1289.2854610209. The cubic root of 1662257 is about 118.4584530358.

It can be divided in two parts, 166225 and 7, that multiplied together give a triangular number (1163575 = T₁₅₂₅).

The spelling of 1662257 in words is "one million, six hundred sixty-two thousand, two hundred fifty-seven".