1899991317 has 72 divisors (see below), whose sum is σ = 3170613600. Its totient is φ = 1006229952.

The previous prime is 1899991307. The next prime is 1899991319. The reversal of 1899991317 is 7131999981.

It is not a de Polignac number, because 1899991317 - 2⁶ = 1899991253 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1899991319) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 17431059 + ... + 17431167.

It is an arithmetic number, because the mean of its divisors is an integer number (44036300).

Almost surely, 2^1899991317 is an apocalyptic number.

It is an amenable number.

1899991317 is a deficient number, since it is larger than the sum of its proper divisors (1270622283).

1899991317 is a wasteful number, since it uses less digits than its factorization.

1899991317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303 (or 217 counting only the distinct ones).

The product of its digits is 1102248, while the sum is 57.

The square root of 1899991317 is about 43588.8898344521. The cubic root of 1899991317 is about 1238.5604428840.

The spelling of 1899991317 in words is "one billion, eight hundred ninety-nine million, nine hundred ninety-one thousand, three hundred seventeen".