199453891 has 16 divisors (see below), whose sum is σ = 247923648. Its totient is φ = 156240000.

The previous prime is 199453873. The next prime is 199453901. The reversal of 199453891 is 198354991.

It is not a de Polignac number, because 199453891 - 2⁷ = 199453763 is a prime.

It is not an unprimeable number, because it can be changed into a prime (199453801) 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, 1660 + ... + 20041.

It is an arithmetic number, because the mean of its divisors is an integer number (15495228).

Almost surely, 2^199453891 is an apocalyptic number.

199453891 is a deficient number, since it is larger than the sum of its proper divisors (48469757).

199453891 is a wasteful number, since it uses less digits than its factorization.

199453891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21822.

The product of its digits is 349920, while the sum is 49.

The square root of 199453891 is about 14122.8145565960. The cubic root of 199453891 is about 584.2707849694.

The spelling of 199453891 in words is "one hundred ninety-nine million, four hundred fifty-three thousand, eight hundred ninety-one".