199802531 has 2 divisors, whose sum is σ = 199802532. Its totient is φ = 199802530.

The previous prime is 199802483. The next prime is 199802539. The reversal of 199802531 is 135208991.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199802531 is a prime.

It is a super-2 number, since 2×199802531² = 79842102788011922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (199802539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99901265 + 99901266.

It is an arithmetic number, because the mean of its divisors is an integer number (99901266).

Almost surely, 2^199802531 is an apocalyptic number.

199802531 is a deficient number, since it is larger than the sum of its proper divisors (1).

199802531 is an equidigital number, since it uses as much as digits as its factorization.

199802531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 38.

The square root of 199802531 is about 14135.1523161231. The cubic root of 199802531 is about 584.6110166442.

The spelling of 199802531 in words is "one hundred ninety-nine million, eight hundred two thousand, five hundred thirty-one".