199749831 has 16 divisors (see below), whose sum is σ = 280650240. Its totient is φ = 126023040.

The previous prime is 199749799. The next prime is 199749853. The reversal of 199749831 is 138947991.

It is a happy number.

It is not a de Polignac number, because 199749831 - 2⁵ = 199749799 is a prime.

It is a super-2 number, since 2×199749831² = 79799989969057122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199745831) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 105711 + ... + 107583.

It is an arithmetic number, because the mean of its divisors is an integer number (17540640).

Almost surely, 2^199749831 is an apocalyptic number.

199749831 is a deficient number, since it is larger than the sum of its proper divisors (80900409).

199749831 is a wasteful number, since it uses less digits than its factorization.

199749831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3766.

The product of its digits is 489888, while the sum is 51.

The square root of 199749831 is about 14133.2880463111. The cubic root of 199749831 is about 584.5596130416.

The spelling of 199749831 in words is "one hundred ninety-nine million, seven hundred forty-nine thousand, eight hundred thirty-one".