65421571 has 2 divisors, whose sum is σ = 65421572. Its totient is φ = 65421570.

The previous prime is 65421529. The next prime is 65421611. The reversal of 65421571 is 17512456.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65421571 - 2⁷ = 65421443 is a prime.

It is not a weakly prime, because it can be changed into another prime (65421271) 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, 32710785 + 32710786.

It is an arithmetic number, because the mean of its divisors is an integer number (32710786).

Almost surely, 2^65421571 is an apocalyptic number.

65421571 is a deficient number, since it is larger than the sum of its proper divisors (1).

65421571 is an equidigital number, since it uses as much as digits as its factorization.

65421571 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8400, while the sum is 31.

The square root of 65421571 is about 8088.3602170032. The cubic root of 65421571 is about 402.9399451177.

The spelling of 65421571 in words is "sixty-five million, four hundred twenty-one thousand, five hundred seventy-one".