19010090091 has 4 divisors (see below), whose sum is σ = 25346786792. Its totient is φ = 12673393392.

The previous prime is 19010090087. The next prime is 19010090101. The reversal of 19010090091 is 19009001091.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19009001091 = 3 ⋅6336333697.

It is not a de Polignac number, because 19010090091 - 2² = 19010090087 is a prime.

It is a super-2 number, since 2×19010090091² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19010092091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3168348346 + ... + 3168348351.

It is an arithmetic number, because the mean of its divisors is an integer number (6336696698).

Almost surely, 2^19010090091 is an apocalyptic number.

19010090091 is a deficient number, since it is larger than the sum of its proper divisors (6336696701).

19010090091 is an equidigital number, since it uses as much as digits as its factorization.

19010090091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6336696700.

The product of its (nonzero) digits is 729, while the sum is 30.

The spelling of 19010090091 in words is "nineteen billion, ten million, ninety thousand, ninety-one".