366538981 has 4 divisors (see below), whose sum is σ = 366590764. Its totient is φ = 366487200.

The previous prime is 366538973. The next prime is 366539011. The reversal of 366538981 is 189835663.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 315630756 + 50908225 = 17766^2 + 7135^2 .

It is a cyclic number.

It is not a de Polignac number, because 366538981 - 2³ = 366538973 is a prime.

It is a super-2 number, since 2×366538981² = 268701649185036722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (366538961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13200 + ... + 30121.

It is an arithmetic number, because the mean of its divisors is an integer number (91647691).

Almost surely, 2^366538981 is an apocalyptic number.

It is an amenable number.

366538981 is a deficient number, since it is larger than the sum of its proper divisors (51783).

366538981 is an equidigital number, since it uses as much as digits as its factorization.

366538981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51782.

The product of its digits is 933120, while the sum is 49.

The square root of 366538981 is about 19145.2077815834. The cubic root of 366538981 is about 715.6599647581.

The spelling of 366538981 in words is "three hundred sixty-six million, five hundred thirty-eight thousand, nine hundred eighty-one".