36571921 has 2 divisors, whose sum is σ = 36571922. Its totient is φ = 36571920.

The previous prime is 36571919. The next prime is 36571933. The reversal of 36571921 is 12917563.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36469521 + 102400 = 6039^2 + 320^2 .

It is an emirp because it is prime and its reverse (12917563) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 36571921 - 2¹ = 36571919 is a prime.

Together with 36571919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (36571121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18285960 + 18285961.

It is an arithmetic number, because the mean of its divisors is an integer number (18285961).

Almost surely, 2^36571921 is an apocalyptic number.

It is an amenable number.

36571921 is a deficient number, since it is larger than the sum of its proper divisors (1).

36571921 is an equidigital number, since it uses as much as digits as its factorization.

36571921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11340, while the sum is 34.

The square root of 36571921 is about 6047.4722818712. The cubic root of 36571921 is about 331.9321031378.

The spelling of 36571921 in words is "thirty-six million, five hundred seventy-one thousand, nine hundred twenty-one".