36851821 has 2 divisors, whose sum is σ = 36851822. Its totient is φ = 36851820.

The previous prime is 36851791. The next prime is 36851831. The reversal of 36851821 is 12815863.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32604100 + 4247721 = 5710^2 + 2061^2 .

It is a cyclic number.

It is not a de Polignac number, because 36851821 - 2¹¹ = 36849773 is a prime.

It is a super-2 number, since 2×36851821² = 2716113422032082, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (36851831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18425910 + 18425911.

It is an arithmetic number, because the mean of its divisors is an integer number (18425911).

Almost surely, 2^36851821 is an apocalyptic number.

It is an amenable number.

36851821 is a deficient number, since it is larger than the sum of its proper divisors (1).

36851821 is an equidigital number, since it uses as much as digits as its factorization.

36851821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11520, while the sum is 34.

The square root of 36851821 is about 6070.5700720773. The cubic root of 36851821 is about 332.7767564058.

The spelling of 36851821 in words is "thirty-six million, eight hundred fifty-one thousand, eight hundred twenty-one".