36811821 has 4 divisors (see below), whose sum is σ = 49082432. Its totient is φ = 24541212.

The previous prime is 36811813. The next prime is 36811861. The reversal of 36811821 is 12811863.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 36811821 - 2³ = 36811813 is a prime.

It is a super-2 number, since 2×36811821² = 2710220330672082, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (36811861) 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, 6135301 + ... + 6135306.

It is an arithmetic number, because the mean of its divisors is an integer number (12270608).

Almost surely, 2^36811821 is an apocalyptic number.

It is an amenable number.

36811821 is a deficient number, since it is larger than the sum of its proper divisors (12270611).

36811821 is a wasteful number, since it uses less digits than its factorization.

36811821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12270610.

The product of its digits is 2304, while the sum is 30.

The square root of 36811821 is about 6067.2745940826. The cubic root of 36811821 is about 332.6563110758.

The spelling of 36811821 in words is "thirty-six million, eight hundred eleven thousand, eight hundred twenty-one".