199992497 has 4 divisors (see below), whose sum is σ = 206888820. Its totient is φ = 193096176.

The previous prime is 199992493. The next prime is 199992509. The reversal of 199992497 is 794299991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 794299991 = 89 ⋅8924719.

It can be written as a sum of positive squares in 2 ways, for example, as 149426176 + 50566321 = 12224^2 + 7111^2 .

It is a cyclic number.

It is not a de Polignac number, because 199992497 - 2² = 199992493 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199992493) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3448118 + ... + 3448175.

It is an arithmetic number, because the mean of its divisors is an integer number (51722205).

Almost surely, 2^199992497 is an apocalyptic number.

It is an amenable number.

199992497 is a deficient number, since it is larger than the sum of its proper divisors (6896323).

199992497 is an equidigital number, since it uses as much as digits as its factorization.

199992497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6896322.

The product of its digits is 3306744, while the sum is 59.

The square root of 199992497 is about 14141.8703501340. The cubic root of 199992497 is about 584.7962345828.

The spelling of 199992497 in words is "one hundred ninety-nine million, nine hundred ninety-two thousand, four hundred ninety-seven".