199025881 has 2 divisors, whose sum is σ = 199025882. Its totient is φ = 199025880.

The previous prime is 199025867. The next prime is 199025903. The reversal of 199025881 is 188520991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 154256400 + 44769481 = 12420^2 + 6691^2 .

It is an emirp because it is prime and its reverse (188520991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199025881 - 2²¹ = 196928729 is a prime.

It is a super-2 number, since 2×199025881² = 79222602615652322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (199025581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99512940 + 99512941.

It is an arithmetic number, because the mean of its divisors is an integer number (99512941).

Almost surely, 2^199025881 is an apocalyptic number.

It is an amenable number.

199025881 is a deficient number, since it is larger than the sum of its proper divisors (1).

199025881 is an equidigital number, since it uses as much as digits as its factorization.

199025881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 43.

The square root of 199025881 is about 14107.6532775653. The cubic root of 199025881 is about 583.8525549222.

The spelling of 199025881 in words is "one hundred ninety-nine million, twenty-five thousand, eight hundred eighty-one".