1313878129 has 4 divisors (see below), whose sum is σ = 1314312100. Its totient is φ = 1313444160.

The previous prime is 1313878117. The next prime is 1313878171. The reversal of 1313878129 is 9218783131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9218783131 = 31 ⋅297380101.

It can be written as a sum of positive squares in 2 ways, for example, as 392634225 + 921243904 = 19815^2 + 30352^2 .

It is a cyclic number.

It is not a de Polignac number, because 1313878129 - 2⁷ = 1313878001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1313878229) 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, 212412 + ... + 218509.

It is an arithmetic number, because the mean of its divisors is an integer number (328578025).

Almost surely, 2^1313878129 is an apocalyptic number.

It is an amenable number.

1313878129 is a deficient number, since it is larger than the sum of its proper divisors (433971).

1313878129 is an equidigital number, since it uses as much as digits as its factorization.

1313878129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433970.

The product of its digits is 72576, while the sum is 43.

The square root of 1313878129 is about 36247.4568625166. The cubic root of 1313878129 is about 1095.2628599636.

The spelling of 1313878129 in words is "one billion, three hundred thirteen million, eight hundred seventy-eight thousand, one hundred twenty-nine".