199325981 has 4 divisors (see below), whose sum is σ = 207992352. Its totient is φ = 190659612.

The previous prime is 199325977. The next prime is 199325983. The reversal of 199325981 is 189523991.

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 a cyclic number.

It is not a de Polignac number, because 199325981 - 2² = 199325977 is a prime.

It is a super-2 number, since 2×199325981² = 79461693403224722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199325983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4333151 + ... + 4333196.

It is an arithmetic number, because the mean of its divisors is an integer number (51998088).

Almost surely, 2^199325981 is an apocalyptic number.

It is an amenable number.

199325981 is a deficient number, since it is larger than the sum of its proper divisors (8666371).

199325981 is an equidigital number, since it uses as much as digits as its factorization.

199325981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8666370.

The product of its digits is 174960, while the sum is 47.

The square root of 199325981 is about 14118.2853420662. The cubic root of 199325981 is about 584.1458604282.

The spelling of 199325981 in words is "one hundred ninety-nine million, three hundred twenty-five thousand, nine hundred eighty-one".