768533621 has 2 divisors, whose sum is σ = 768533622. Its totient is φ = 768533620.

The previous prime is 768533593. The next prime is 768533629. The reversal of 768533621 is 126335867.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 650811121 + 117722500 = 25511^2 + 10850^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-768533621 is a prime.

It is a Sophie Germain 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 (768533629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 384266810 + 384266811.

It is an arithmetic number, because the mean of its divisors is an integer number (384266811).

Almost surely, 2^768533621 is an apocalyptic number.

It is an amenable number.

768533621 is a deficient number, since it is larger than the sum of its proper divisors (1).

768533621 is an equidigital number, since it uses as much as digits as its factorization.

768533621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 41.

The square root of 768533621 is about 27722.4389439313. The cubic root of 768533621 is about 915.9834433962.

The spelling of 768533621 in words is "seven hundred sixty-eight million, five hundred thirty-three thousand, six hundred twenty-one".