199979629 has 2 divisors, whose sum is σ = 199979630. Its totient is φ = 199979628.

The previous prime is 199979623. The next prime is 199979651. The reversal of 199979629 is 926979991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119464900 + 80514729 = 10930^2 + 8973^2 .

It is a cyclic number.

It is not a de Polignac number, because 199979629 - 2⁵ = 199979597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199979623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99989814 + 99989815.

It is an arithmetic number, because the mean of its divisors is an integer number (99989815).

Almost surely, 2^199979629 is an apocalyptic number.

It is an amenable number.

199979629 is a deficient number, since it is larger than the sum of its proper divisors (1).

199979629 is an equidigital number, since it uses as much as digits as its factorization.

199979629 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4960116, while the sum is 61.

The square root of 199979629 is about 14141.4153817784. The cubic root of 199979629 is about 584.7836919133.

The spelling of 199979629 in words is "one hundred ninety-nine million, nine hundred seventy-nine thousand, six hundred twenty-nine".