80812621 has 2 divisors, whose sum is σ = 80812622. Its totient is φ = 80812620.

The previous prime is 80812619. The next prime is 80812637. The reversal of 80812621 is 12621808.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70795396 + 10017225 = 8414^2 + 3165^2 .

It is a cyclic number.

It is not a de Polignac number, because 80812621 - 2¹ = 80812619 is a prime.

Together with 80812619, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 80812621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80812661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40406310 + 40406311.

It is an arithmetic number, because the mean of its divisors is an integer number (40406311).

Almost surely, 2^80812621 is an apocalyptic number.

It is an amenable number.

80812621 is a deficient number, since it is larger than the sum of its proper divisors (1).

80812621 is an equidigital number, since it uses as much as digits as its factorization.

80812621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 80812621 is about 8989.5840281962. The cubic root of 80812621 is about 432.3409748700.

The spelling of 80812621 in words is "eighty million, eight hundred twelve thousand, six hundred twenty-one".