64133621 has 2 divisors, whose sum is σ = 64133622. Its totient is φ = 64133620.

The previous prime is 64133611. The next prime is 64133633. The reversal of 64133621 is 12633146.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39828721 + 24304900 = 6311^2 + 4930^2 .

It is a cyclic number.

It is not a de Polignac number, because 64133621 - 2⁶ = 64133557 is a prime.

It is a super-2 number, since 2×64133621² = 8226242685143282, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64133611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32066810 + 32066811.

It is an arithmetic number, because the mean of its divisors is an integer number (32066811).

Almost surely, 2^64133621 is an apocalyptic number.

It is an amenable number.

64133621 is a deficient number, since it is larger than the sum of its proper divisors (1).

64133621 is an equidigital number, since it uses as much as digits as its factorization.

64133621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 26.

The square root of 64133621 is about 8008.3469580182. The cubic root of 64133621 is about 400.2781835732.

Adding to 64133621 its reverse (12633146), we get a palindrome (76766767).

The spelling of 64133621 in words is "sixty-four million, one hundred thirty-three thousand, six hundred twenty-one".