1531297 has 2 divisors, whose sum is σ = 1531298. Its totient is φ = 1531296.

The previous prime is 1531279. The next prime is 1531303. The reversal of 1531297 is 7921351.

Together with previous prime (1531279) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1218816 + 312481 = 1104^2 + 559^2 .

It is an emirp because it is prime and its reverse (7921351) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1531297 - 2¹¹ = 1529249 is a prime.

It is not a weakly prime, because it can be changed into another prime (1531217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 765648 + 765649.

It is an arithmetic number, because the mean of its divisors is an integer number (765649).

2^1531297 is an apocalyptic number.

It is an amenable number.

1531297 is a deficient number, since it is larger than the sum of its proper divisors (1).

1531297 is an equidigital number, since it uses as much as digits as its factorization.

1531297 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 1531297 is about 1237.4558577986. The cubic root of 1531297 is about 115.2620865575.

The spelling of 1531297 in words is "one million, five hundred thirty-one thousand, two hundred ninety-seven".