1949691919 has 8 divisors (see below), whose sum is σ = 2273693600. Its totient is φ = 1671164208.

The previous prime is 1949691907. The next prime is 1949691941. The reversal of 1949691919 is 9191969491.

It is not a de Polignac number, because 1949691919 - 2⁹ = 1949691407 is a prime.

It is a super-2 number, since 2×1949691919² = 7602597158027805122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1949691319) 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, 2841774 + ... + 2842459.

It is an arithmetic number, because the mean of its divisors is an integer number (284211700).

Almost surely, 2^1949691919 is an apocalyptic number.

1949691919 is a deficient number, since it is larger than the sum of its proper divisors (324001681).

1949691919 is an frugal number, since it uses more digits than its factorization.

1949691919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5684254 (or 5684240 counting only the distinct ones).

The product of its digits is 1417176, while the sum is 58.

The square root of 1949691919 is about 44155.3158634382. The cubic root of 1949691919 is about 1249.2671798503.

The spelling of 1949691919 in words is "one billion, nine hundred forty-nine million, six hundred ninety-one thousand, nine hundred nineteen".