76997621 has 2 divisors, whose sum is σ = 76997622. Its totient is φ = 76997620.

The previous prime is 76997611. The next prime is 76997651. The reversal of 76997621 is 12679967.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60684100 + 16313521 = 7790^2 + 4039^2 .

It is a cyclic number.

It is not a de Polignac number, because 76997621 - 2¹⁰ = 76996597 is a prime.

It is a Sophie Germain prime.

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 (76997611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38498810 + 38498811.

It is an arithmetic number, because the mean of its divisors is an integer number (38498811).

Almost surely, 2^76997621 is an apocalyptic number.

It is an amenable number.

76997621 is a deficient number, since it is larger than the sum of its proper divisors (1).

76997621 is an equidigital number, since it uses as much as digits as its factorization.

76997621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 285768, while the sum is 47.

The square root of 76997621 is about 8774.8288302394. The cubic root of 76997621 is about 425.4277050684.

The spelling of 76997621 in words is "seventy-six million, nine hundred ninety-seven thousand, six hundred twenty-one".