199374491 has 4 divisors (see below), whose sum is σ = 201237912. Its totient is φ = 197511072.

The previous prime is 199374481. The next prime is 199374493. The reversal of 199374491 is 194473991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 194473991 = 103 ⋅1888097.

It is a cyclic number.

It is not a de Polignac number, because 199374491 - 2²² = 195180187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199374493) 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, 931550 + ... + 931763.

It is an arithmetic number, because the mean of its divisors is an integer number (50309478).

Almost surely, 2^199374491 is an apocalyptic number.

199374491 is a deficient number, since it is larger than the sum of its proper divisors (1863421).

199374491 is a wasteful number, since it uses less digits than its factorization.

199374491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1863420.

The product of its digits is 244944, while the sum is 47.

The square root of 199374491 is about 14120.0032223792. The cubic root of 199374491 is about 584.1932444790.

The spelling of 199374491 in words is "one hundred ninety-nine million, three hundred seventy-four thousand, four hundred ninety-one".