186538949 has 2 divisors, whose sum is σ = 186538950. Its totient is φ = 186538948.

The previous prime is 186538879. The next prime is 186538951. The reversal of 186538949 is 949835681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 185368225 + 1170724 = 13615^2 + 1082^2 .

It is an emirp because it is prime and its reverse (949835681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 186538949 - 2²⁴ = 169761733 is a prime.

Together with 186538951, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 186538949.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (186538999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93269474 + 93269475.

It is an arithmetic number, because the mean of its divisors is an integer number (93269475).

Almost surely, 2^186538949 is an apocalyptic number.

It is an amenable number.

186538949 is a deficient number, since it is larger than the sum of its proper divisors (1).

186538949 is an equidigital number, since it uses as much as digits as its factorization.

186538949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1866240, while the sum is 53.

The square root of 186538949 is about 13657.9262335100. The cubic root of 186538949 is about 571.3775535017.

The spelling of 186538949 in words is "one hundred eighty-six million, five hundred thirty-eight thousand, nine hundred forty-nine".