190555981 has 16 divisors (see below), whose sum is σ = 238043520. Its totient is φ = 148193280.

The previous prime is 190555961. The next prime is 190556011. The reversal of 190555981 is 189555091.

It is a cyclic number.

It is not a de Polignac number, because 190555981 - 2⁵ = 190555949 is a prime.

It is a super-2 number, since 2×190555981² = 72623163789744722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (190555901) 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 in 15 ways as a sum of consecutive naturals, for example, 42285 + ... + 46573.

It is an arithmetic number, because the mean of its divisors is an integer number (14877720).

Almost surely, 2^190555981 is an apocalyptic number.

190555981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

190555981 is a deficient number, since it is larger than the sum of its proper divisors (47487539).

190555981 is a wasteful number, since it uses less digits than its factorization.

190555981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4884.

The product of its (nonzero) digits is 81000, while the sum is 43.

The square root of 190555981 is about 13804.2015705364. The cubic root of 190555981 is about 575.4499122698.

The spelling of 190555981 in words is "one hundred ninety million, five hundred fifty-five thousand, nine hundred eighty-one".