36557621 has 2 divisors, whose sum is σ = 36557622. Its totient is φ = 36557620.

The previous prime is 36557617. The next prime is 36557623. The reversal of 36557621 is 12675563.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22193521 + 14364100 = 4711^2 + 3790^2 .

It is a cyclic number.

It is not a de Polignac number, because 36557621 - 2² = 36557617 is a prime.

It is a Sophie Germain prime.

Together with 36557623, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (36557623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18278810 + 18278811.

It is an arithmetic number, because the mean of its divisors is an integer number (18278811).

Almost surely, 2^36557621 is an apocalyptic number.

It is an amenable number.

36557621 is a deficient number, since it is larger than the sum of its proper divisors (1).

36557621 is an equidigital number, since it uses as much as digits as its factorization.

36557621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37800, while the sum is 35.

The square root of 36557621 is about 6046.2898541172. The cubic root of 36557621 is about 331.8888345341. Note that the first 4 decimals are identical.

The spelling of 36557621 in words is "thirty-six million, five hundred fifty-seven thousand, six hundred twenty-one".