199543831 has 2 divisors, whose sum is σ = 199543832. Its totient is φ = 199543830.

The previous prime is 199543819. The next prime is 199543847. The reversal of 199543831 is 138345991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 199543831 - 2⁹ = 199543319 is a prime.

It is a super-2 number, since 2×199543831² = 79635480980313122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199243831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99771915 + 99771916.

It is an arithmetic number, because the mean of its divisors is an integer number (99771916).

Almost surely, 2^199543831 is an apocalyptic number.

199543831 is a deficient number, since it is larger than the sum of its proper divisors (1).

199543831 is an equidigital number, since it uses as much as digits as its factorization.

199543831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 43.

The square root of 199543831 is about 14125.9984071923. The cubic root of 199543831 is about 584.3585937648.

The spelling of 199543831 in words is "one hundred ninety-nine million, five hundred forty-three thousand, eight hundred thirty-one".