186161481 has 24 divisors (see below), whose sum is σ = 294053760. Its totient is φ = 112552800.

The previous prime is 186161477. The next prime is 186161497. The reversal of 186161481 is 184161681.

186161481 is a `hidden beast` number, since 18 + 6 + 161 + 481 = 666.

It is not a de Polignac number, because 186161481 - 2² = 186161477 is a prime.

It is a super-2 number, since 2×186161481² = 69312194016226722, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (186161681) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 43600 + ... + 47678.

It is an arithmetic number, because the mean of its divisors is an integer number (12252240).

Almost surely, 2^186161481 is an apocalyptic number.

186161481 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

186161481 is a deficient number, since it is larger than the sum of its proper divisors (107892279).

186161481 is a wasteful number, since it uses less digits than its factorization.

186161481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4557 (or 4554 counting only the distinct ones).

The product of its digits is 9216, while the sum is 36.

The square root of 186161481 is about 13644.1005932967. The cubic root of 186161481 is about 570.9918925201.

The spelling of 186161481 in words is "one hundred eighty-six million, one hundred sixty-one thousand, four hundred eighty-one".