80185621 has 2 divisors, whose sum is σ = 80185622. Its totient is φ = 80185620.

The previous prime is 80185601. The next prime is 80185631. The reversal of 80185621 is 12658108.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72063121 + 8122500 = 8489^2 + 2850^2 .

It is a cyclic number.

It is not a de Polignac number, because 80185621 - 2¹⁷ = 80054549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80185601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40092810 + 40092811.

It is an arithmetic number, because the mean of its divisors is an integer number (40092811).

Almost surely, 2^80185621 is an apocalyptic number.

It is an amenable number.

80185621 is a deficient number, since it is larger than the sum of its proper divisors (1).

80185621 is an equidigital number, since it uses as much as digits as its factorization.

80185621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3840, while the sum is 31.

The square root of 80185621 is about 8954.6424272553. The cubic root of 80185621 is about 431.2199375249.

The spelling of 80185621 in words is "eighty million, one hundred eighty-five thousand, six hundred twenty-one".