1911920913 has 12 divisors (see below), whose sum is σ = 3156187008. Its totient is φ = 1092526200.

The previous prime is 1911920821. The next prime is 1911920921. The reversal of 1911920913 is 3190291191.

It is not a de Polignac number, because 1911920913 - 2¹² = 1911916817 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1911922913) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15173913 + ... + 15174038.

It is an arithmetic number, because the mean of its divisors is an integer number (263015584).

Almost surely, 2^1911920913 is an apocalyptic number.

It is an amenable number.

1911920913 is a deficient number, since it is larger than the sum of its proper divisors (1244266095).

1911920913 is a wasteful number, since it uses less digits than its factorization.

1911920913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30347964 (or 30347961 counting only the distinct ones).

The product of its (nonzero) digits is 4374, while the sum is 36.

The square root of 1911920913 is about 43725.5178700036. The cubic root of 1911920913 is about 1241.1472457785.

The spelling of 1911920913 in words is "one billion, nine hundred eleven million, nine hundred twenty thousand, nine hundred thirteen".