1912999897 has 4 divisors (see below), whose sum is σ = 1915903440. Its totient is φ = 1910096356.

The previous prime is 1912999883. The next prime is 1912999903. The reversal of 1912999897 is 7989992191.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1912999897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1912999807) 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, 1450783 + ... + 1452100.

It is an arithmetic number, because the mean of its divisors is an integer number (478975860).

Almost surely, 2^1912999897 is an apocalyptic number.

It is an amenable number.

1912999897 is a deficient number, since it is larger than the sum of its proper divisors (2903543).

1912999897 is an equidigital number, since it uses as much as digits as its factorization.

1912999897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2903542.

The product of its digits is 6613488, while the sum is 64.

The square root of 1912999897 is about 43737.8542797883. The cubic root of 1912999897 is about 1241.3806805002.

The spelling of 1912999897 in words is "one billion, nine hundred twelve million, nine hundred ninety-nine thousand, eight hundred ninety-seven".