36637621 has 2 divisors, whose sum is σ = 36637622. Its totient is φ = 36637620.

The previous prime is 36637613. The next prime is 36637631. The reversal of 36637621 is 12673663.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36469521 + 168100 = 6039^2 + 410^2 .

It is an emirp because it is prime and its reverse (12673663) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 36637621 - 2³ = 36637613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (36637631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18318810 + 18318811.

It is an arithmetic number, because the mean of its divisors is an integer number (18318811).

Almost surely, 2^36637621 is an apocalyptic number.

It is an amenable number.

36637621 is a deficient number, since it is larger than the sum of its proper divisors (1).

36637621 is an equidigital number, since it uses as much as digits as its factorization.

36637621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 34.

The square root of 36637621 is about 6052.9018660474. The cubic root of 36637621 is about 332.1307518330.

The spelling of 36637621 in words is "thirty-six million, six hundred thirty-seven thousand, six hundred twenty-one".