1531272397 has 2 divisors, whose sum is σ = 1531272398. Its totient is φ = 1531272396.

The previous prime is 1531272383. The next prime is 1531272419. The reversal of 1531272397 is 7932721351.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1412331561 + 118940836 = 37581^2 + 10906^2 .

It is a cyclic number.

It is not a de Polignac number, because 1531272397 - 2²⁷ = 1397054669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1531272697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 765636198 + 765636199.

It is an arithmetic number, because the mean of its divisors is an integer number (765636199).

Almost surely, 2^1531272397 is an apocalyptic number.

It is an amenable number.

1531272397 is a deficient number, since it is larger than the sum of its proper divisors (1).

1531272397 is an equidigital number, since it uses as much as digits as its factorization.

1531272397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 79380, while the sum is 40.

The square root of 1531272397 is about 39131.4757835684. The cubic root of 1531272397 is about 1152.6146925759.

The spelling of 1531272397 in words is "one billion, five hundred thirty-one million, two hundred seventy-two thousand, three hundred ninety-seven".