36172521 has 64 divisors (see below), whose sum is σ = 67829760. Its totient is φ = 18506880.

The previous prime is 36172511. The next prime is 36172531. The reversal of 36172521 is 12527163.

It is a happy number.

36172521 is a `hidden beast` number, since 3 + 617 + 25 + 21 = 666.

It is an interprime number because it is at equal distance from previous prime (36172511) and next prime (36172531).

It is not a de Polignac number, because 36172521 - 2⁶ = 36172457 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (36172501) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 263965 + ... + 264101.

It is an arithmetic number, because the mean of its divisors is an integer number (1059840).

Almost surely, 2^36172521 is an apocalyptic number.

It is an amenable number.

36172521 is a deficient number, since it is larger than the sum of its proper divisors (31657239).

36172521 is a wasteful number, since it uses less digits than its factorization.

36172521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291 (or 285 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 36172521 is about 6014.3595669032. The cubic root of 36172521 is about 330.7193399215.

Adding to 36172521 its reverse (12527163), we get a palindrome (48699684).

The spelling of 36172521 in words is "thirty-six million, one hundred seventy-two thousand, five hundred twenty-one".