36172721 has 16 divisors (see below), whose sum is σ = 40884480. Its totient is φ = 31753920.

The previous prime is 36172711. The next prime is 36172727. The reversal of 36172721 is 12727163.

It is a cyclic number.

It is not a de Polignac number, because 36172721 - 2²² = 31978417 is a prime.

It is not an unprimeable number, because it can be changed into a prime (36172727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92795 + ... + 93183.

It is an arithmetic number, because the mean of its divisors is an integer number (2555280).

Almost surely, 2^36172721 is an apocalyptic number.

It is an amenable number.

36172721 is a deficient number, since it is larger than the sum of its proper divisors (4711759).

36172721 is a wasteful number, since it uses less digits than its factorization.

36172721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 736.

The product of its digits is 3528, while the sum is 29.

The square root of 36172721 is about 6014.3761937544. The cubic root of 36172721 is about 330.7199494426.

Adding to 36172721 its reverse (12727163), we get a palindrome (48899884).

The spelling of 36172721 in words is "thirty-six million, one hundred seventy-two thousand, seven hundred twenty-one".