186949109 has 6 divisors (see below), whose sum is σ = 193471830. Its totient is φ = 180431496.

The previous prime is 186949097. The next prime is 186949141. The reversal of 186949109 is 901949681.

It can be written as a sum of positive squares in only one way, i.e., 161163025 + 25786084 = 12695^2 + 5078^2 .

It is not a de Polignac number, because 186949109 - 2⁴ = 186949093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (186949309) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 72362 + ... + 74900.

It is an arithmetic number, because the mean of its divisors is an integer number (32245305).

Almost surely, 2^186949109 is an apocalyptic number.

It is an amenable number.

186949109 is a deficient number, since it is larger than the sum of its proper divisors (6522721).

186949109 is an frugal number, since it uses more digits than its factorization.

186949109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5107 (or 2568 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 47.

The square root of 186949109 is about 13672.9334453145. The cubic root of 186949109 is about 571.7960267150.

The spelling of 186949109 in words is "one hundred eighty-six million, nine hundred forty-nine thousand, one hundred nine".