36531813 has 16 divisors (see below), whose sum is σ = 51448320. Its totient is φ = 22993776.

The previous prime is 36531809. The next prime is 36531821. The reversal of 36531813 is 31813563.

It is not a de Polignac number, because 36531813 - 2² = 36531809 is a prime.

It is a super-2 number, since 2×36531813² = 2669146722133938, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (36531413) 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, 18856 + ... + 20702.

It is an arithmetic number, because the mean of its divisors is an integer number (3215520).

Almost surely, 2^36531813 is an apocalyptic number.

It is an amenable number.

36531813 is a deficient number, since it is larger than the sum of its proper divisors (14916507).

36531813 is a wasteful number, since it uses less digits than its factorization.

36531813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2216.

The product of its digits is 6480, while the sum is 30.

The square root of 36531813 is about 6044.1552759670. The cubic root of 36531813 is about 331.8107167282.

The spelling of 36531813 in words is "thirty-six million, five hundred thirty-one thousand, eight hundred thirteen".