1313111921 has 4 divisors (see below), whose sum is σ = 1432485744. Its totient is φ = 1193738100.

The previous prime is 1313111881. The next prime is 1313111927. The reversal of 1313111921 is 1291113131.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 1313111921 - 2³⁰ = 239370097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1313111927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59686895 + ... + 59686916.

It is an arithmetic number, because the mean of its divisors is an integer number (358121436).

Almost surely, 2^1313111921 is an apocalyptic number.

1313111921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1313111921 is a deficient number, since it is larger than the sum of its proper divisors (119373823).

1313111921 is a wasteful number, since it uses less digits than its factorization.

1313111921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119373822.

The product of its digits is 162, while the sum is 23.

The square root of 1313111921 is about 36236.8861934907. The cubic root of 1313111921 is about 1095.0499121692.

It can be divided in two parts, 13131 and 11921, that added together give a palindrome (25052).

The spelling of 1313111921 in words is "one billion, three hundred thirteen million, one hundred eleven thousand, nine hundred twenty-one".