366181981 has 8 divisors (see below), whose sum is σ = 400343328. Its totient is φ = 332166000.

The previous prime is 366181979. The next prime is 366181987. The reversal of 366181981 is 189181663.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 366181981 - 2¹ = 366181979 is a prime.

It is a super-2 number, since 2×366181981² = 268178486418168722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (366181987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31035 + ... + 41176.

It is an arithmetic number, because the mean of its divisors is an integer number (50042916).

Almost surely, 2^366181981 is an apocalyptic number.

It is an amenable number.

366181981 is a deficient number, since it is larger than the sum of its proper divisors (34161347).

366181981 is a wasteful number, since it uses less digits than its factorization.

366181981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72683.

The product of its digits is 62208, while the sum is 43.

The square root of 366181981 is about 19135.8820282735. The cubic root of 366181981 is about 715.4275441855.

The spelling of 366181981 in words is "three hundred sixty-six million, one hundred eighty-one thousand, nine hundred eighty-one".