191998601 has 2 divisors, whose sum is σ = 191998602. Its totient is φ = 191998600.

The previous prime is 191998571. The next prime is 191998603. The reversal of 191998601 is 106899191.

191998601 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 140446201 + 51552400 = 11851^2 + 7180^2 .

It is a cyclic number.

It is not a de Polignac number, because 191998601 - 2²² = 187804297 is a prime.

Together with 191998603, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (191998603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95999300 + 95999301.

It is an arithmetic number, because the mean of its divisors is an integer number (95999301).

Almost surely, 2^191998601 is an apocalyptic number.

It is an amenable number.

191998601 is a deficient number, since it is larger than the sum of its proper divisors (1).

191998601 is an equidigital number, since it uses as much as digits as its factorization.

191998601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 44.

The square root of 191998601 is about 13856.3559783949. The cubic root of 191998601 is about 576.8984269340.

The spelling of 191998601 in words is "one hundred ninety-one million, nine hundred ninety-eight thousand, six hundred one".