65981371 has 2 divisors, whose sum is σ = 65981372. Its totient is φ = 65981370.

The previous prime is 65981347. The next prime is 65981387. The reversal of 65981371 is 17318956.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65981371 - 2¹¹ = 65979323 is a prime.

It is not a weakly prime, because it can be changed into another prime (65981171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32990685 + 32990686.

It is an arithmetic number, because the mean of its divisors is an integer number (32990686).

Almost surely, 2^65981371 is an apocalyptic number.

65981371 is a deficient number, since it is larger than the sum of its proper divisors (1).

65981371 is an equidigital number, since it uses as much as digits as its factorization.

65981371 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360, while the sum is 40.

The square root of 65981371 is about 8122.8917880272. The cubic root of 65981371 is about 404.0859761306.

The spelling of 65981371 in words is "sixty-five million, nine hundred eighty-one thousand, three hundred seventy-one".