186486961 has 2 divisors, whose sum is σ = 186486962. Its totient is φ = 186486960.

The previous prime is 186486953. The next prime is 186487027. The reversal of 186486961 is 169684681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 186486336 + 625 = 13656^2 + 25^2 .

It is an emirp because it is prime and its reverse (169684681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 186486961 - 2³ = 186486953 is a prime.

It is not a weakly prime, because it can be changed into another prime (186486931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93243480 + 93243481.

It is an arithmetic number, because the mean of its divisors is an integer number (93243481).

Almost surely, 2^186486961 is an apocalyptic number.

It is an amenable number.

186486961 is a deficient number, since it is larger than the sum of its proper divisors (1).

186486961 is an equidigital number, since it uses as much as digits as its factorization.

186486961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 497664, while the sum is 49.

The square root of 186486961 is about 13656.0228836949. The cubic root of 186486961 is about 571.3244680087.

The spelling of 186486961 in words is "one hundred eighty-six million, four hundred eighty-six thousand, nine hundred sixty-one".