1916346891 has 4 divisors (see below), whose sum is σ = 2555129192. Its totient is φ = 1277564592.

The previous prime is 1916346863. The next prime is 1916346907. The reversal of 1916346891 is 1986436191.

It is a happy number.

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

It is not a de Polignac number, because 1916346891 - 2⁷ = 1916346763 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1916346891.

It is not an unprimeable number, because it can be changed into a prime (1916346851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 319391146 + ... + 319391151.

It is an arithmetic number, because the mean of its divisors is an integer number (638782298).

Almost surely, 2^1916346891 is an apocalyptic number.

1916346891 is a deficient number, since it is larger than the sum of its proper divisors (638782301).

1916346891 is an equidigital number, since it uses as much as digits as its factorization.

1916346891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 638782300.

The product of its digits is 279936, while the sum is 48.

The square root of 1916346891 is about 43776.0995407311. The cubic root of 1916346891 is about 1242.1042339285.

The spelling of 1916346891 in words is "one billion, nine hundred sixteen million, three hundred forty-six thousand, eight hundred ninety-one".