2091319931 has 4 divisors (see below), whose sum is σ = 2111624112. Its totient is φ = 2071015752.

The previous prime is 2091319927. The next prime is 2091319939. The reversal of 2091319931 is 1399131902.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2091319931 - 2² = 2091319927 is a prime.

It is a super-2 number, since 2×2091319931² = 8747238107595689522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2091319939) 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, 10151936 + ... + 10152141.

It is an arithmetic number, because the mean of its divisors is an integer number (527906028).

Almost surely, 2^2091319931 is an apocalyptic number.

2091319931 is a deficient number, since it is larger than the sum of its proper divisors (20304181).

2091319931 is a wasteful number, since it uses less digits than its factorization.

2091319931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20304180.

The product of its (nonzero) digits is 13122, while the sum is 38.

The square root of 2091319931 is about 45730.9515645585. The cubic root of 2091319931 is about 1278.8123609226.

The spelling of 2091319931 in words is "two billion, ninety-one million, three hundred nineteen thousand, nine hundred thirty-one".