199877531121 has 40 divisors (see below), whose sum is σ = 314561957600. Its totient is φ = 126132163200.

The previous prime is 199877531101. The next prime is 199877531131. The reversal of 199877531121 is 121135778991.

199877531121 is a `hidden beast` number, since 1 + 9 + 9 + 87 + 7 + 531 + 1 + 21 = 666.

It is not a de Polignac number, because 199877531121 - 2¹⁷ = 199877400049 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (199877531101) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1794270 + ... + 1902408.

It is an arithmetic number, because the mean of its divisors is an integer number (7864048940).

Almost surely, 2^199877531121 is an apocalyptic number.

It is an amenable number.

199877531121 is a deficient number, since it is larger than the sum of its proper divisors (114684426479).

199877531121 is a wasteful number, since it uses less digits than its factorization.

199877531121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109371 (or 109362 counting only the distinct ones).

The product of its digits is 952560, while the sum is 54.

The spelling of 199877531121 in words is "one hundred ninety-nine billion, eight hundred seventy-seven million, five hundred thirty-one thousand, one hundred twenty-one".