1531317379 has 2 divisors, whose sum is σ = 1531317380. Its totient is φ = 1531317378.

The previous prime is 1531317371. The next prime is 1531317397. The reversal of 1531317379 is 9737131351.

Together with next prime (1531317397) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1531317379 - 2³ = 1531317371 is a prime.

It is not a weakly prime, because it can be changed into another prime (1531317371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 765658689 + 765658690.

It is an arithmetic number, because the mean of its divisors is an integer number (765658690).

Almost surely, 2^1531317379 is an apocalyptic number.

1531317379 is a deficient number, since it is larger than the sum of its proper divisors (1).

1531317379 is an equidigital number, since it uses as much as digits as its factorization.

1531317379 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 59535, while the sum is 40.

The square root of 1531317379 is about 39132.0505340571. The cubic root of 1531317379 is about 1152.6259787034.

The spelling of 1531317379 in words is "one billion, five hundred thirty-one million, three hundred seventeen thousand, three hundred seventy-nine".