1313523161 has 4 divisors (see below), whose sum is σ = 1319259300. Its totient is φ = 1307787024.

The previous prime is 1313523157. The next prime is 1313523203. The reversal of 1313523161 is 1613253131.

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 487305625 + 826217536 = 22075^2 + 28744^2 .

It is a cyclic number.

It is not a de Polignac number, because 1313523161 - 2² = 1313523157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1313523161.

It is not an unprimeable number, because it can be changed into a prime (1313523131) 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, 2867726 + ... + 2868183.

It is an arithmetic number, because the mean of its divisors is an integer number (329814825).

Almost surely, 2^1313523161 is an apocalyptic number.

It is an amenable number.

1313523161 is a deficient number, since it is larger than the sum of its proper divisors (5736139).

1313523161 is an equidigital number, since it uses as much as digits as its factorization.

1313523161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5736138.

The product of its digits is 1620, while the sum is 26.

The square root of 1313523161 is about 36242.5600778974. The cubic root of 1313523161 is about 1095.1642160392.

Adding to 1313523161 its reverse (1613253131), we get a palindrome (2926776292).

The spelling of 1313523161 in words is "one billion, three hundred thirteen million, five hundred twenty-three thousand, one hundred sixty-one".