1231457 has 2 divisors, whose sum is σ = 1231458. Its totient is φ = 1231456.

The previous prime is 1231453. The next prime is 1231459. The reversal of 1231457 is 7541321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 707281 + 524176 = 841^2 + 724^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231457 - 2² = 1231453 is a prime.

Together with 1231459, 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 (1231453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615728 + 615729.

It is an arithmetic number, because the mean of its divisors is an integer number (615729).

2^1231457 is an apocalyptic number.

It is an amenable number.

1231457 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231457 is an equidigital number, since it uses as much as digits as its factorization.

1231457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 840, while the sum is 23.

The square root of 1231457 is about 1109.7103225617. The cubic root of 1231457 is about 107.1864162357.

Adding to 1231457 its reverse (7541321), we get a palindrome (8772778).

The spelling of 1231457 in words is "one million, two hundred thirty-one thousand, four hundred fifty-seven".