199291123 has 2 divisors, whose sum is σ = 199291124. Its totient is φ = 199291122.

The previous prime is 199291121. The next prime is 199291129. The reversal of 199291123 is 321192991.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 199291123 - 2¹ = 199291121 is a prime.

It is a super-2 number, since 2×199291123² = 79433903413202258, which contains 22 as substring.

Together with 199291121, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (199291121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99645561 + 99645562.

It is an arithmetic number, because the mean of its divisors is an integer number (99645562).

Almost surely, 2^199291123 is an apocalyptic number.

199291123 is a deficient number, since it is larger than the sum of its proper divisors (1).

199291123 is an equidigital number, since it uses as much as digits as its factorization.

199291123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8748, while the sum is 37.

The square root of 199291123 is about 14117.0507897365. The cubic root of 199291123 is about 584.1118067583. Note that the first 3 decimals are identical.

The spelling of 199291123 in words is "one hundred ninety-nine million, two hundred ninety-one thousand, one hundred twenty-three".