197900999 has 2 divisors, whose sum is σ = 197901000. Its totient is φ = 197900998.

The previous prime is 197900981. The next prime is 197901013. The reversal of 197900999 is 999009791.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 197900999 - 2⁸ = 197900743 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 197900999.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197900939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98950499 + 98950500.

It is an arithmetic number, because the mean of its divisors is an integer number (98950500).

Almost surely, 2^197900999 is an apocalyptic number.

197900999 is a deficient number, since it is larger than the sum of its proper divisors (1).

197900999 is an equidigital number, since it uses as much as digits as its factorization.

197900999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 413343, while the sum is 53.

The square root of 197900999 is about 14067.7289922716. The cubic root of 197900999 is about 582.7505098708.

The spelling of 197900999 in words is "one hundred ninety-seven million, nine hundred thousand, nine hundred ninety-nine".