199161631 has 2 divisors, whose sum is σ = 199161632. Its totient is φ = 199161630.

The previous prime is 199161539. The next prime is 199161649. The reversal of 199161631 is 136161991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 199161631 - 2⁹ = 199161119 is a prime.

It is a super-2 number, since 2×199161631² = 79330710525160322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199161671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99580815 + 99580816.

It is an arithmetic number, because the mean of its divisors is an integer number (99580816).

Almost surely, 2^199161631 is an apocalyptic number.

199161631 is a deficient number, since it is larger than the sum of its proper divisors (1).

199161631 is an equidigital number, since it uses as much as digits as its factorization.

199161631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8748, while the sum is 37.

The square root of 199161631 is about 14112.4636757726. The cubic root of 199161631 is about 583.9852679323.

The spelling of 199161631 in words is "one hundred ninety-nine million, one hundred sixty-one thousand, six hundred thirty-one".