1912289991 has 8 divisors (see below), whose sum is σ = 2558423280. Its totient is φ = 1270508352.

The previous prime is 1912289971. The next prime is 1912289993. The reversal of 1912289991 is 1999822191.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1912289991 - 2⁵ = 1912289959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1912289993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1086886 + ... + 1088643.

It is an arithmetic number, because the mean of its divisors is an integer number (319802910).

Almost surely, 2^1912289991 is an apocalyptic number.

1912289991 is a deficient number, since it is larger than the sum of its proper divisors (646133289).

1912289991 is a wasteful number, since it uses less digits than its factorization.

1912289991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2175825.

The product of its digits is 209952, while the sum is 51.

The square root of 1912289991 is about 43729.7380623301. The cubic root of 1912289991 is about 1241.2271044984.

The spelling of 1912289991 in words is "one billion, nine hundred twelve million, two hundred eighty-nine thousand, nine hundred ninety-one".