80621869 has 2 divisors, whose sum is σ = 80621870. Its totient is φ = 80621868.

The previous prime is 80621843. The next prime is 80621881. The reversal of 80621869 is 96812608.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41409225 + 39212644 = 6435^2 + 6262^2 .

It is a cyclic number.

It is not a de Polignac number, because 80621869 - 2⁹ = 80621357 is a prime.

It is a super-2 number, since 2×80621869² = 12999771522106322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80621819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40310934 + 40310935.

It is an arithmetic number, because the mean of its divisors is an integer number (40310935).

Almost surely, 2^80621869 is an apocalyptic number.

It is an amenable number.

80621869 is a deficient number, since it is larger than the sum of its proper divisors (1).

80621869 is an equidigital number, since it uses as much as digits as its factorization.

80621869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 80621869 is about 8978.9681478442. The cubic root of 80621869 is about 432.0005376222. Note that the first 3 decimals are identical.

The spelling of 80621869 in words is "eighty million, six hundred twenty-one thousand, eight hundred sixty-nine".