187696081 has 2 divisors, whose sum is σ = 187696082. Its totient is φ = 187696080.

The previous prime is 187696049. The next prime is 187696087. The reversal of 187696081 is 180696781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 146531025 + 41165056 = 12105^2 + 6416^2 .

It is an emirp because it is prime and its reverse (180696781) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 187696081 - 2⁵ = 187696049 is a prime.

It is a super-2 number, since 2×187696081² = 70459637645517122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (187696087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93848040 + 93848041.

It is an arithmetic number, because the mean of its divisors is an integer number (93848041).

Almost surely, 2^187696081 is an apocalyptic number.

It is an amenable number.

187696081 is a deficient number, since it is larger than the sum of its proper divisors (1).

187696081 is an equidigital number, since it uses as much as digits as its factorization.

187696081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 187696081 is about 13700.2219325090. The cubic root of 187696081 is about 572.5565688463.

The spelling of 187696081 in words is "one hundred eighty-seven million, six hundred ninety-six thousand, eighty-one".