80389921 has 2 divisors, whose sum is σ = 80389922. Its totient is φ = 80389920.

The previous prime is 80389909. The next prime is 80389927. The reversal of 80389921 is 12998308.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41152225 + 39237696 = 6415^2 + 6264^2 .

It is a cyclic number.

It is not a de Polignac number, because 80389921 - 2¹⁹ = 79865633 is a prime.

It is not a weakly prime, because it can be changed into another prime (80389927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40194960 + 40194961.

It is an arithmetic number, because the mean of its divisors is an integer number (40194961).

Almost surely, 2^80389921 is an apocalyptic number.

It is an amenable number.

80389921 is a deficient number, since it is larger than the sum of its proper divisors (1).

80389921 is an equidigital number, since it uses as much as digits as its factorization.

80389921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 80389921 is about 8966.0426610629. The cubic root of 80389921 is about 431.5858531668.

The spelling of 80389921 in words is "eighty million, three hundred eighty-nine thousand, nine hundred twenty-one".