981200191 has 4 divisors (see below), whose sum is σ = 995019984. Its totient is φ = 967380400.

The previous prime is 981200177. The next prime is 981200201. The reversal of 981200191 is 191002189.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 981200191 - 2⁷ = 981200063 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 (981200111) 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, 6909790 + ... + 6909931.

It is an arithmetic number, because the mean of its divisors is an integer number (248754996).

Almost surely, 2^981200191 is an apocalyptic number.

981200191 is a deficient number, since it is larger than the sum of its proper divisors (13819793).

981200191 is a wasteful number, since it uses less digits than its factorization.

981200191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13819792.

The product of its (nonzero) digits is 1296, while the sum is 31.

The square root of 981200191 is about 31324.1151670722. The cubic root of 981200191 is about 993.6937113220.

The spelling of 981200191 in words is "nine hundred eighty-one million, two hundred thousand, one hundred ninety-one".