1351531913 has 4 divisors (see below), whose sum is σ = 1384496148. Its totient is φ = 1318567680.

The previous prime is 1351531901. The next prime is 1351531927. The reversal of 1351531913 is 3191351531.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 182439049 + 1169092864 = 13507^2 + 34192^2 .

It is a cyclic number.

It is not a de Polignac number, because 1351531913 - 2²⁴ = 1334754697 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1351531913.

It is not an unprimeable number, because it can be changed into a prime (1351531963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16482056 + ... + 16482137.

It is an arithmetic number, because the mean of its divisors is an integer number (346124037).

Almost surely, 2^1351531913 is an apocalyptic number.

It is an amenable number.

1351531913 is a deficient number, since it is larger than the sum of its proper divisors (32964235).

1351531913 is an equidigital number, since it uses as much as digits as its factorization.

1351531913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32964234.

The product of its digits is 6075, while the sum is 32.

The square root of 1351531913 is about 36763.1869265982. The cubic root of 1351531913 is about 1105.6273371767.

The spelling of 1351531913 in words is "one billion, three hundred fifty-one million, five hundred thirty-one thousand, nine hundred thirteen".