1313023121 has 4 divisors (see below), whose sum is σ = 1313720100. Its totient is φ = 1312326144.

The previous prime is 1313023097. The next prime is 1313023133. The reversal of 1313023121 is 1213203131.

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 391050625 + 921972496 = 19775^2 + 30364^2 .

It is a cyclic number.

It is not a de Polignac number, because 1313023121 - 2¹⁰ = 1313022097 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 1313023121.

It is not an unprimeable number, because it can be changed into a prime (1313023021) 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, 345656 + ... + 349433.

It is an arithmetic number, because the mean of its divisors is an integer number (328430025).

Almost surely, 2^1313023121 is an apocalyptic number.

It is an amenable number.

1313023121 is a deficient number, since it is larger than the sum of its proper divisors (696979).

1313023121 is an equidigital number, since it uses as much as digits as its factorization.

1313023121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 696978.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 1313023121 is about 36235.6609019347. The cubic root of 1313023121 is about 1095.0252271385.

Adding to 1313023121 its reverse (1213203131), we get a palindrome (2526226252).

The spelling of 1313023121 in words is "one billion, three hundred thirteen million, twenty-three thousand, one hundred twenty-one".