1231597 has 2 divisors, whose sum is σ = 1231598. Its totient is φ = 1231596.

The previous prime is 1231589. The next prime is 1231613. The reversal of 1231597 is 7951321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1028196 + 203401 = 1014^2 + 451^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231597 - 2³ = 1231589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615798 + 615799.

It is an arithmetic number, because the mean of its divisors is an integer number (615799).

2^1231597 is an apocalyptic number.

It is an amenable number.

1231597 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231597 is an equidigital number, since it uses as much as digits as its factorization.

1231597 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1890, while the sum is 28.

The square root of 1231597 is about 1109.7734002940. The cubic root of 1231597 is about 107.1904779635.

The spelling of 1231597 in words is "one million, two hundred thirty-one thousand, five hundred ninety-seven".