1397531 has 2 divisors, whose sum is σ = 1397532. Its totient is φ = 1397530.

The previous prime is 1397521. The next prime is 1397551. The reversal of 1397531 is 1357931.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1397531 - 2¹⁴ = 1381147 is a prime.

It is a super-2 number, since 2×1397531² = 3906185791922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1397494 and 1397503.

It is not a weakly prime, because it can be changed into another prime (1397521) 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, 698765 + 698766.

It is an arithmetic number, because the mean of its divisors is an integer number (698766).

2^1397531 is an apocalyptic number.

1397531 is a deficient number, since it is larger than the sum of its proper divisors (1).

1397531 is an equidigital number, since it uses as much as digits as its factorization.

1397531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2835, while the sum is 29.

The square root of 1397531 is about 1182.1721532839. The cubic root of 1397531 is about 111.8030925825.

The spelling of 1397531 in words is "one million, three hundred ninety-seven thousand, five hundred thirty-one".