1911913345 has 4 divisors (see below), whose sum is σ = 2294296020. Its totient is φ = 1529530672.

The previous prime is 1911913337. The next prime is 1911913357. The reversal of 1911913345 is 5433191191.

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

It can be written as a sum of positive squares in 2 ways, for example, as 488586816 + 1423326529 = 22104^2 + 37727^2 .

It is a cyclic number.

It is not a de Polignac number, because 1911913345 - 2³ = 1911913337 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 191191330 + ... + 191191339.

It is an arithmetic number, because the mean of its divisors is an integer number (573574005).

Almost surely, 2^1911913345 is an apocalyptic number.

It is an amenable number.

1911913345 is a deficient number, since it is larger than the sum of its proper divisors (382382675).

1911913345 is an equidigital number, since it uses as much as digits as its factorization.

1911913345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382382674.

The product of its digits is 14580, while the sum is 37.

The square root of 1911913345 is about 43725.4313300624. The cubic root of 1911913345 is about 1241.1456081559.

The spelling of 1911913345 in words is "one billion, nine hundred eleven million, nine hundred thirteen thousand, three hundred forty-five".