36638557 has 2 divisors, whose sum is σ = 36638558. Its totient is φ = 36638556.

The previous prime is 36638533. The next prime is 36638561. The reversal of 36638557 is 75583663.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32501401 + 4137156 = 5701^2 + 2034^2 .

It is an emirp because it is prime and its reverse (75583663) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-36638557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (36638527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18319278 + 18319279.

It is an arithmetic number, because the mean of its divisors is an integer number (18319279).

Almost surely, 2^36638557 is an apocalyptic number.

It is an amenable number.

36638557 is a deficient number, since it is larger than the sum of its proper divisors (1).

36638557 is an equidigital number, since it uses as much as digits as its factorization.

36638557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 453600, while the sum is 43.

The square root of 36638557 is about 6052.9791838400. The cubic root of 36638557 is about 332.1335801801.

The spelling of 36638557 in words is "thirty-six million, six hundred thirty-eight thousand, five hundred fifty-seven".