199450397 has 2 divisors, whose sum is σ = 199450398. Its totient is φ = 199450396.

The previous prime is 199450379. The next prime is 199450399. The reversal of 199450397 is 793054991.

Together with previous prime (199450379) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 171845881 + 27604516 = 13109^2 + 5254^2 .

It is a cyclic number.

It is not a de Polignac number, because 199450397 - 2²⁰ = 198401821 is a prime.

Together with 199450399, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199450399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99725198 + 99725199.

It is an arithmetic number, because the mean of its divisors is an integer number (99725199).

Almost surely, 2^199450397 is an apocalyptic number.

It is an amenable number.

199450397 is a deficient number, since it is larger than the sum of its proper divisors (1).

199450397 is an equidigital number, since it uses as much as digits as its factorization.

199450397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 306180, while the sum is 47.

The square root of 199450397 is about 14122.6908554992. The cubic root of 199450397 is about 584.2673732301.

The spelling of 199450397 in words is "one hundred ninety-nine million, four hundred fifty thousand, three hundred ninety-seven".