199621079 has 16 divisors (see below), whose sum is σ = 234240000. Its totient is φ = 166567104.

The previous prime is 199621069. The next prime is 199621091. The reversal of 199621079 is 970126991.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199621079 is a prime.

It is a super-2 number, since 2×199621079² = 79697150362248482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199621069) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63947 + ... + 66995.

It is an arithmetic number, because the mean of its divisors is an integer number (14640000).

Almost surely, 2^199621079 is an apocalyptic number.

199621079 is a deficient number, since it is larger than the sum of its proper divisors (34618921).

199621079 is a wasteful number, since it uses less digits than its factorization.

199621079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3302.

The product of its (nonzero) digits is 61236, while the sum is 44.

The square root of 199621079 is about 14128.7323918319. The cubic root of 199621079 is about 584.4339902473.

The spelling of 199621079 in words is "one hundred ninety-nine million, six hundred twenty-one thousand, seventy-nine".