199089251 has 2 divisors, whose sum is σ = 199089252. Its totient is φ = 199089250.

The previous prime is 199089199. The next prime is 199089257. The reversal of 199089251 is 152980991.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (152980991) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199089251 is a prime.

It is not a weakly prime, because it can be changed into another prime (199089257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99544625 + 99544626.

It is an arithmetic number, because the mean of its divisors is an integer number (99544626).

Almost surely, 2^199089251 is an apocalyptic number.

199089251 is a deficient number, since it is larger than the sum of its proper divisors (1).

199089251 is an equidigital number, since it uses as much as digits as its factorization.

199089251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58320, while the sum is 44.

The square root of 199089251 is about 14109.8990428706. The cubic root of 199089251 is about 583.9145147204.

The spelling of 199089251 in words is "one hundred ninety-nine million, eighty-nine thousand, two hundred fifty-one".