36771981 has 4 divisors (see below), whose sum is σ = 49029312. Its totient is φ = 24514652.

The previous prime is 36771967. The next prime is 36771989. The reversal of 36771981 is 18917763.

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 a cyclic number.

It is not a de Polignac number, because 36771981 - 2⁵ = 36771949 is a prime.

It is a super-2 number, since 2×36771981² = 2704357173328722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (36771989) 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, 6128661 + ... + 6128666.

It is an arithmetic number, because the mean of its divisors is an integer number (12257328).

Almost surely, 2^36771981 is an apocalyptic number.

It is an amenable number.

36771981 is a deficient number, since it is larger than the sum of its proper divisors (12257331).

36771981 is a wasteful number, since it uses less digits than its factorization.

36771981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12257330.

The product of its digits is 63504, while the sum is 42.

The square root of 36771981 is about 6063.9905178026. The cubic root of 36771981 is about 332.5362607674.

The spelling of 36771981 in words is "thirty-six million, seven hundred seventy-one thousand, nine hundred eighty-one".