365638081 has 4 divisors (see below), whose sum is σ = 365789952. Its totient is φ = 365486212.

The previous prime is 365638019. The next prime is 365638111. The reversal of 365638081 is 180836563.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-365638081 is a prime.

It is a super-2 number, since 2×365638081² = 267382412554725122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (365638681) 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, 72265 + ... + 77158.

It is an arithmetic number, because the mean of its divisors is an integer number (91447488).

Almost surely, 2^365638081 is an apocalyptic number.

It is an amenable number.

365638081 is a deficient number, since it is larger than the sum of its proper divisors (151871).

365638081 is a wasteful number, since it uses less digits than its factorization.

365638081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151870.

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 365638081 is about 19121.6652256021. The cubic root of 365638081 is about 715.0731540389.

It can be divided in two parts, 36563 and 8081, that added together give a palindrome (44644).

The spelling of 365638081 in words is "three hundred sixty-five million, six hundred thirty-eight thousand, eighty-one".