1531389313 has 2 divisors, whose sum is σ = 1531389314. Its totient is φ = 1531389312.

The previous prime is 1531389311. The next prime is 1531389397. The reversal of 1531389313 is 3139831351.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1328383809 + 203005504 = 36447^2 + 14248^2 .

It is an emirp because it is prime and its reverse (3139831351) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1531389313 - 2¹ = 1531389311 is a prime.

It is a super-2 number, since 2×1531389313² = 4690306455941223938, which contains 22 as substring.

Together with 1531389311, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1531389311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 765694656 + 765694657.

It is an arithmetic number, because the mean of its divisors is an integer number (765694657).

Almost surely, 2^1531389313 is an apocalyptic number.

It is an amenable number.

1531389313 is a deficient number, since it is larger than the sum of its proper divisors (1).

1531389313 is an equidigital number, since it uses as much as digits as its factorization.

1531389313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29160, while the sum is 37.

The square root of 1531389313 is about 39132.9696419784. The cubic root of 1531389313 is about 1152.6440267144.

The spelling of 1531389313 in words is "one billion, five hundred thirty-one million, three hundred eighty-nine thousand, three hundred thirteen".