36181531 has 8 divisors (see below), whose sum is σ = 37795680. Its totient is φ = 34591872.

The previous prime is 36181513. The next prime is 36181543. The reversal of 36181531 is 13518163.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 36181531 - 2⁵ = 36181499 is a prime.

It is a super-2 number, since 2×36181531² = 2618206371007922, which contains 22 as substring.

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 36181531.

It is not an unprimeable number, because it can be changed into a prime (36181591) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3070 + ... + 9043.

It is an arithmetic number, because the mean of its divisors is an integer number (4724460).

Almost surely, 2^36181531 is an apocalyptic number.

36181531 is a deficient number, since it is larger than the sum of its proper divisors (1614149).

36181531 is a wasteful number, since it uses less digits than its factorization.

36181531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12245.

The product of its digits is 2160, while the sum is 28.

The square root of 36181531 is about 6015.1085609488. The cubic root of 36181531 is about 330.7467966188.

Adding to 36181531 its reverse (13518163), we get a palindrome (49699694).

The spelling of 36181531 in words is "thirty-six million, one hundred eighty-one thousand, five hundred thirty-one".