199901479 has 2 divisors, whose sum is σ = 199901480. Its totient is φ = 199901478.

The previous prime is 199901477. The next prime is 199901497. The reversal of 199901479 is 974109991.

It is a happy number.

199901479 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with next prime (199901497) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is an emirp because it is prime and its reverse (974109991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199901479 - 2¹ = 199901477 is a prime.

Together with 199901477, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199901477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99950739 + 99950740.

It is an arithmetic number, because the mean of its divisors is an integer number (99950740).

Almost surely, 2^199901479 is an apocalyptic number.

199901479 is a deficient number, since it is larger than the sum of its proper divisors (1).

199901479 is an equidigital number, since it uses as much as digits as its factorization.

199901479 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 183708, while the sum is 49.

The square root of 199901479 is about 14138.6519513000. The cubic root of 199901479 is about 584.7075061535.

The spelling of 199901479 in words is "one hundred ninety-nine million, nine hundred one thousand, four hundred seventy-nine".