1919949931 has 4 divisors (see below), whose sum is σ = 1920142192. Its totient is φ = 1919757672.

The previous prime is 1919949917. The next prime is 1919949937. The reversal of 1919949931 is 1399499191.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1399499191 = 15383 ⋅90977.

It is a cyclic number.

It is not a de Polignac number, because 1919949931 - 2⁹ = 1919949419 is a prime.

It is a super-2 number, since 2×1919949931² = 7372415475093809522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1919949937) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80280 + ... + 101413.

It is an arithmetic number, because the mean of its divisors is an integer number (480035548).

Almost surely, 2^1919949931 is an apocalyptic number.

1919949931 is a deficient number, since it is larger than the sum of its proper divisors (192261).

1919949931 is a wasteful number, since it uses less digits than its factorization.

1919949931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192260.

The product of its digits is 708588, while the sum is 55.

The square root of 1919949931 is about 43817.2332650066. The cubic root of 1919949931 is about 1242.8821983970.

The spelling of 1919949931 in words is "one billion, nine hundred nineteen million, nine hundred forty-nine thousand, nine hundred thirty-one".