80045921 has 2 divisors, whose sum is σ = 80045922. Its totient is φ = 80045920.

The previous prime is 80045909. The next prime is 80045963. The reversal of 80045921 is 12954008.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79405921 + 640000 = 8911^2 + 800^2 .

It is a cyclic number.

It is not a de Polignac number, because 80045921 - 2⁶ = 80045857 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (80045971) 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, 40022960 + 40022961.

It is an arithmetic number, because the mean of its divisors is an integer number (40022961).

Almost surely, 2^80045921 is an apocalyptic number.

It is an amenable number.

80045921 is a deficient number, since it is larger than the sum of its proper divisors (1).

80045921 is an equidigital number, since it uses as much as digits as its factorization.

80045921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 80045921 is about 8946.8386036633. The cubic root of 80045921 is about 430.9693670661.

Adding to 80045921 its reverse (12954008), we get a palindrome (92999929).

The spelling of 80045921 in words is "eighty million, forty-five thousand, nine hundred twenty-one".