1919999997 has 8 divisors (see below), whose sum is σ = 2844444480. Its totient is φ = 1279999980.

The previous prime is 1919999953. The next prime is 1920000037. The reversal of 1919999997 is 7999999191.

It is not a de Polignac number, because 1919999997 - 2⁶ = 1919999933 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1919999197) 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, 35555529 + ... + 35555582.

It is an arithmetic number, because the mean of its divisors is an integer number (355555560).

Almost surely, 2^1919999997 is an apocalyptic number.

It is an amenable number.

1919999997 is a deficient number, since it is larger than the sum of its proper divisors (924444483).

1919999997 is an equidigital number, since it uses as much as digits as its factorization.

1919999997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71111120 (or 71111114 counting only the distinct ones).

The product of its digits is 33480783, while the sum is 72.

The square root of 1919999997 is about 43817.8045661806. The cubic root of 1919999997 is about 1242.8930017342.

It can be divided in two parts, 1919999 and 997, that added together give a square (1920996 = 1386²).

The spelling of 1919999997 in words is "one billion, nine hundred nineteen million, nine hundred ninety-nine thousand, nine hundred ninety-seven".