199261631 has 2 divisors, whose sum is σ = 199261632. Its totient is φ = 199261630.

The previous prime is 199261591. The next prime is 199261649. The reversal of 199261631 is 136162991.

It is a strong prime.

It is an emirp because it is prime and its reverse (136162991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199261631 - 2⁶ = 199261567 is a prime.

It is a super-2 number, since 2×199261631² = 79410395177560322, 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 (199261651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99630815 + 99630816.

It is an arithmetic number, because the mean of its divisors is an integer number (99630816).

Almost surely, 2^199261631 is an apocalyptic number.

199261631 is a deficient number, since it is larger than the sum of its proper divisors (1).

199261631 is an equidigital number, since it uses as much as digits as its factorization.

199261631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17496, while the sum is 38.

The square root of 199261631 is about 14116.0061986385. The cubic root of 199261631 is about 584.0829921696.

The spelling of 199261631 in words is "one hundred ninety-nine million, two hundred sixty-one thousand, six hundred thirty-one".