65481571 has 2 divisors, whose sum is σ = 65481572. Its totient is φ = 65481570.

The previous prime is 65481557. The next prime is 65481589. The reversal of 65481571 is 17518456.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65481571 - 2⁷ = 65481443 is a prime.

It is a super-2 number, since 2×65481571² = 8575672281256082, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 65481571.

It is not a weakly prime, because it can be changed into another prime (65488571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32740785 + 32740786.

It is an arithmetic number, because the mean of its divisors is an integer number (32740786).

Almost surely, 2^65481571 is an apocalyptic number.

65481571 is a deficient number, since it is larger than the sum of its proper divisors (1).

65481571 is an equidigital number, since it uses as much as digits as its factorization.

65481571 is an evil number, because the sum of its binary digits is even.

The product of its digits is 33600, while the sum is 37.

The square root of 65481571 is about 8092.0684006007. The cubic root of 65481571 is about 403.0630900740.

It can be divided in two parts, 65 and 481571, that added together give a square (481636 = 694²).

The spelling of 65481571 in words is "sixty-five million, four hundred eighty-one thousand, five hundred seventy-one".