36581021 has 2 divisors, whose sum is σ = 36581022. Its totient is φ = 36581020.

The previous prime is 36581009. The next prime is 36581033. The reversal of 36581021 is 12018563.

It is a balanced prime because it is at equal distance from previous prime (36581009) and next prime (36581033).

It can be written as a sum of positive squares in only one way, i.e., 36132121 + 448900 = 6011^2 + 670^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-36581021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (36581071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18290510 + 18290511.

It is an arithmetic number, because the mean of its divisors is an integer number (18290511).

Almost surely, 2^36581021 is an apocalyptic number.

It is an amenable number.

36581021 is a deficient number, since it is larger than the sum of its proper divisors (1).

36581021 is an equidigital number, since it uses as much as digits as its factorization.

36581021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 36581021 is about 6048.2246155380. The cubic root of 36581021 is about 331.9596318315.

Adding to 36581021 its reverse (12018563), we get a palindrome (48599584).

The spelling of 36581021 in words is "thirty-six million, five hundred eighty-one thousand, twenty-one".