199201581981 has 48 divisors (see below), whose sum is σ = 303056208000. Its totient is φ = 125842628736.

The previous prime is 199201581967. The next prime is 199201581983. The reversal of 199201581981 is 189185102991.

It is a happy number.

It is not a de Polignac number, because 199201581981 - 2¹¹ = 199201579933 is a prime.

It is a super-2 number, since 2×199201581981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199201581983) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11989626 + ... + 12006228.

It is an arithmetic number, because the mean of its divisors is an integer number (6313671000).

Almost surely, 2^199201581981 is an apocalyptic number.

It is an amenable number.

199201581981 is a deficient number, since it is larger than the sum of its proper divisors (103854626019).

199201581981 is a wasteful number, since it uses less digits than its factorization.

199201581981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17170 (or 17167 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 54.

The spelling of 199201581981 in words is "one hundred ninety-nine billion, two hundred one million, five hundred eighty-one thousand, nine hundred eighty-one".