36181621 has 4 divisors (see below), whose sum is σ = 41350432. Its totient is φ = 31012812.

The previous prime is 36181603. The next prime is 36181657. The reversal of 36181621 is 12618163.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12618163 = 2713 ⋅4651.

It is a cyclic number.

It is not a de Polignac number, because 36181621 - 2⁹ = 36181109 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 36181621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (36181421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2584395 + ... + 2584408.

It is an arithmetic number, because the mean of its divisors is an integer number (10337608).

Almost surely, 2^36181621 is an apocalyptic number.

It is an amenable number.

36181621 is a deficient number, since it is larger than the sum of its proper divisors (5168811).

36181621 is an equidigital number, since it uses as much as digits as its factorization.

36181621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5168810.

The product of its digits is 1728, while the sum is 28.

The square root of 36181621 is about 6015.1160421059. The cubic root of 36181621 is about 330.7470708581.

Adding to 36181621 its reverse (12618163), we get a palindrome (48799784).

It can be divided in two parts, 3618162 and 1, that added together give a palindrome (3618163).

The spelling of 36181621 in words is "thirty-six million, one hundred eighty-one thousand, six hundred twenty-one".