1313142121 has 4 divisors (see below), whose sum is σ = 1315093972. Its totient is φ = 1311190272.

The previous prime is 1313142097. The next prime is 1313142143. The reversal of 1313142121 is 1212413131.

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 874030096 + 439112025 = 29564^2 + 20955^2 .

It is a cyclic number.

It is not a de Polignac number, because 1313142121 - 2⁷ = 1313141993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1313142221) 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, 974916 + ... + 976261.

It is an arithmetic number, because the mean of its divisors is an integer number (328773493).

Almost surely, 2^1313142121 is an apocalyptic number.

It is an amenable number.

1313142121 is a deficient number, since it is larger than the sum of its proper divisors (1951851).

1313142121 is an equidigital number, since it uses as much as digits as its factorization.

1313142121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1951850.

The product of its digits is 144, while the sum is 19.

The square root of 1313142121 is about 36237.3028935654. The cubic root of 1313142121 is about 1095.0583070500.

Adding to 1313142121 its reverse (1212413131), we get a palindrome (2525555252).

The spelling of 1313142121 in words is "one billion, three hundred thirteen million, one hundred forty-two thousand, one hundred twenty-one".