36441781 has 4 divisors (see below), whose sum is σ = 37426732. Its totient is φ = 35456832.

The previous prime is 36441773. The next prime is 36441799. The reversal of 36441781 is 18714463.

It is a happy number.

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 22714756 + 13727025 = 4766^2 + 3705^2 .

It is a cyclic number.

It is not a de Polignac number, because 36441781 - 2³ = 36441773 is a prime.

It is a super-2 number, since 2×36441781² = 2656006804903922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (36441721) 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, 492420 + ... + 492493.

It is an arithmetic number, because the mean of its divisors is an integer number (9356683).

Almost surely, 2^36441781 is an apocalyptic number.

It is an amenable number.

36441781 is a deficient number, since it is larger than the sum of its proper divisors (984951).

36441781 is an equidigital number, since it uses as much as digits as its factorization.

36441781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 984950.

The product of its digits is 16128, while the sum is 34.

The square root of 36441781 is about 6036.7028252184. The cubic root of 36441781 is about 331.5379119714.

The spelling of 36441781 in words is "thirty-six million, four hundred forty-one thousand, seven hundred eighty-one".