1931089013 has 4 divisors (see below), whose sum is σ = 2206958880. Its totient is φ = 1655219148.

The previous prime is 1931089009. The next prime is 1931089031. The reversal of 1931089013 is 3109801391.

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 1931089013 - 2² = 1931089009 is a prime.

It is a super-2 number, since 2×1931089013² = 7458209552258628338, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1931089003) 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, 137934923 + ... + 137934936.

It is an arithmetic number, because the mean of its divisors is an integer number (551739720).

Almost surely, 2^1931089013 is an apocalyptic number.

It is an amenable number.

1931089013 is a deficient number, since it is larger than the sum of its proper divisors (275869867).

1931089013 is an equidigital number, since it uses as much as digits as its factorization.

1931089013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275869866.

The product of its (nonzero) digits is 5832, while the sum is 35.

The square root of 1931089013 is about 43944.1578938543. The cubic root of 1931089013 is about 1245.2811981833.

The spelling of 1931089013 in words is "one billion, nine hundred thirty-one million, eighty-nine thousand, thirteen".