1999416091 has 2 divisors, whose sum is σ = 1999416092. Its totient is φ = 1999416090.

The previous prime is 1999416073. The next prime is 1999416109. The reversal of 1999416091 is 1906149991.

It is a happy number.

Together with next prime (1999416109) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (1999416073) and next prime (1999416109).

It is an emirp because it is prime and its reverse (1906149991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1999416091 - 2²⁹ = 1462545179 is a prime.

It is not a weakly prime, because it can be changed into another prime (1999416031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999708045 + 999708046.

It is an arithmetic number, because the mean of its divisors is an integer number (999708046).

Almost surely, 2^1999416091 is an apocalyptic number.

1999416091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1999416091 is an equidigital number, since it uses as much as digits as its factorization.

1999416091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 157464, while the sum is 49.

The square root of 1999416091 is about 44714.8307723511. The cubic root of 1999416091 is about 1259.7984247537.

The spelling of 1999416091 in words is "one billion, nine hundred ninety-nine million, four hundred sixteen thousand, ninety-one".