199523431 has 2 divisors, whose sum is σ = 199523432. Its totient is φ = 199523430.

The previous prime is 199523353. The next prime is 199523437. The reversal of 199523431 is 134325991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 199523431 - 2²¹ = 197426279 is a prime.

It is a super-2 number, since 2×199523431² = 79619199036023522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199523437) 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, 99761715 + 99761716.

It is an arithmetic number, because the mean of its divisors is an integer number (99761716).

Almost surely, 2^199523431 is an apocalyptic number.

199523431 is a deficient number, since it is larger than the sum of its proper divisors (1).

199523431 is an equidigital number, since it uses as much as digits as its factorization.

199523431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29160, while the sum is 37.

The square root of 199523431 is about 14125.2763158814. The cubic root of 199523431 is about 584.3386794741.

The spelling of 199523431 in words is "one hundred ninety-nine million, five hundred twenty-three thousand, four hundred thirty-one".