537636221 has 2 divisors, whose sum is σ = 537636222. Its totient is φ = 537636220.

The previous prime is 537636199. The next prime is 537636223. The reversal of 537636221 is 122636735.

537636221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 427910596 + 109725625 = 20686^2 + 10475^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-537636221 is a prime.

It is a super-2 number, since 2×537636221² = 578105412262321682, which contains 22 as substring.

Together with 537636223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (537636223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 268818110 + 268818111.

It is an arithmetic number, because the mean of its divisors is an integer number (268818111).

Almost surely, 2^537636221 is an apocalyptic number.

It is an amenable number.

537636221 is a deficient number, since it is larger than the sum of its proper divisors (1).

537636221 is an equidigital number, since it uses as much as digits as its factorization.

537636221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360, while the sum is 35.

The square root of 537636221 is about 23186.9838702665. The cubic root of 537636221 is about 813.1353463972.

The spelling of 537636221 in words is "five hundred thirty-seven million, six hundred thirty-six thousand, two hundred twenty-one".