36523981 has 4 divisors (see below), whose sum is σ = 39333532. Its totient is φ = 33714432.

The previous prime is 36523969. The next prime is 36524003. The reversal of 36523981 is 18932563.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10666756 + 25857225 = 3266^2 + 5085^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-36523981 is a prime.

It is a super-2 number, since 2×36523981² = 2668002376176722, 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 36523981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (36523951) 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, 1404756 + ... + 1404781.

It is an arithmetic number, because the mean of its divisors is an integer number (9833383).

Almost surely, 2^36523981 is an apocalyptic number.

It is an amenable number.

36523981 is a deficient number, since it is larger than the sum of its proper divisors (2809551).

36523981 is a wasteful number, since it uses less digits than its factorization.

36523981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2809550.

The product of its digits is 38880, while the sum is 37.

The square root of 36523981 is about 6043.5073425950. The cubic root of 36523981 is about 331.7870029013.

The spelling of 36523981 in words is "thirty-six million, five hundred twenty-three thousand, nine hundred eighty-one".