80021957 has 2 divisors, whose sum is σ = 80021958. Its totient is φ = 80021956.

The previous prime is 80021927. The next prime is 80021959. The reversal of 80021957 is 75912008.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44009956 + 36012001 = 6634^2 + 6001^2 .

It is a cyclic number.

It is not a de Polignac number, because 80021957 - 2¹⁴ = 80005573 is a prime.

Together with 80021959, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80021959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40010978 + 40010979.

It is an arithmetic number, because the mean of its divisors is an integer number (40010979).

Almost surely, 2^80021957 is an apocalyptic number.

It is an amenable number.

80021957 is a deficient number, since it is larger than the sum of its proper divisors (1).

80021957 is an equidigital number, since it uses as much as digits as its factorization.

80021957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 80021957 is about 8945.4992594041. The cubic root of 80021957 is about 430.9263551692.

The spelling of 80021957 in words is "eighty million, twenty-one thousand, nine hundred fifty-seven".