1313121001 has 4 divisors (see below), whose sum is σ = 1314330112. Its totient is φ = 1311911892.

The previous prime is 1313120947. The next prime is 1313121011. The reversal of 1313121001 is 1001213131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1001213131 = 1429 ⋅700639.

It is a cyclic number.

It is not a de Polignac number, because 1313121001 - 2²³ = 1304732393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1313121011) 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, 602925 + ... + 605098.

It is an arithmetic number, because the mean of its divisors is an integer number (328582528).

Almost surely, 2^1313121001 is an apocalyptic number.

It is an amenable number.

1313121001 is a deficient number, since it is larger than the sum of its proper divisors (1209111).

1313121001 is a wasteful number, since it uses less digits than its factorization.

1313121001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1209110.

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 1313121001 is about 36237.0114799772. The cubic root of 1313121001 is about 1095.0524362065.

Adding to 1313121001 its reverse (1001213131), we get a palindrome (2314334132).

The spelling of 1313121001 in words is "one billion, three hundred thirteen million, one hundred twenty-one thousand, one".