1912459917 has 4 divisors (see below), whose sum is σ = 2549946560. Its totient is φ = 1274973276.

The previous prime is 1912459907. The next prime is 1912459943. The reversal of 1912459917 is 7199542191.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7199542191 = 3 ⋅2399847397.

It is not a de Polignac number, because 1912459917 - 2⁷ = 1912459789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1912459907) 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, 318743317 + ... + 318743322.

It is an arithmetic number, because the mean of its divisors is an integer number (637486640).

Almost surely, 2^1912459917 is an apocalyptic number.

It is an amenable number.

1912459917 is a deficient number, since it is larger than the sum of its proper divisors (637486643).

1912459917 is an equidigital number, since it uses as much as digits as its factorization.

1912459917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 637486642.

The product of its digits is 204120, while the sum is 48.

The square root of 1912459917 is about 43731.6809304193. The cubic root of 1912459917 is about 1241.2638685372.

The spelling of 1912459917 in words is "one billion, nine hundred twelve million, four hundred fifty-nine thousand, nine hundred seventeen".