199741621 has 4 divisors (see below), whose sum is σ = 200577600. Its totient is φ = 198905644.

The previous prime is 199741603. The next prime is 199741639. The reversal of 199741621 is 126147991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (199741603) and next prime (199741639).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199741621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199741021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 417631 + ... + 418108.

It is an arithmetic number, because the mean of its divisors is an integer number (50144400).

Almost surely, 2^199741621 is an apocalyptic number.

It is an amenable number.

199741621 is a deficient number, since it is larger than the sum of its proper divisors (835979).

199741621 is an equidigital number, since it uses as much as digits as its factorization.

199741621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 835978.

The product of its digits is 27216, while the sum is 40.

The square root of 199741621 is about 14132.9975942827. The cubic root of 199741621 is about 584.5516041902.

The spelling of 199741621 in words is "one hundred ninety-nine million, seven hundred forty-one thousand, six hundred twenty-one".