199212631 has 2 divisors, whose sum is σ = 199212632. Its totient is φ = 199212630.

The previous prime is 199212623. The next prime is 199212661. The reversal of 199212631 is 136212991.

It is a weak prime.

It is an emirp because it is prime and its reverse (136212991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199212631 - 2³ = 199212623 is a prime.

It is a super-2 number, since 2×199212631² = 79371344699884322, which contains 22 as substring.

It is equal to p_11037697 and since 199212631 and 11037697 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199212661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99606315 + 99606316.

It is an arithmetic number, because the mean of its divisors is an integer number (99606316).

Almost surely, 2^199212631 is an apocalyptic number.

199212631 is a deficient number, since it is larger than the sum of its proper divisors (1).

199212631 is an equidigital number, since it uses as much as digits as its factorization.

199212631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5832, while the sum is 34.

The square root of 199212631 is about 14114.2704735314. The cubic root of 199212631 is about 584.0351113796.

The spelling of 199212631 in words is "one hundred ninety-nine million, two hundred twelve thousand, six hundred thirty-one".