1912998997 has 16 divisors (see below), whose sum is σ = 2355534720. Its totient is φ = 1512891072.

The previous prime is 1912998977. The next prime is 1912999003. The reversal of 1912998997 is 7998992191.

It is a de Polignac number, because none of the positive numbers 2^k-1912998997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1912998977) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 305298 + ... + 311500.

It is an arithmetic number, because the mean of its divisors is an integer number (147220920).

Almost surely, 2^1912998997 is an apocalyptic number.

It is an amenable number.

1912998997 is a deficient number, since it is larger than the sum of its proper divisors (442535723).

1912998997 is a wasteful number, since it uses less digits than its factorization.

1912998997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9612.

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

The square root of 1912998997 is about 43737.8439912166. The cubic root of 1912998997 is about 1241.3804858247.

The spelling of 1912998997 in words is "one billion, nine hundred twelve million, nine hundred ninety-eight thousand, nine hundred ninety-seven".