64471481 has 2 divisors, whose sum is σ = 64471482. Its totient is φ = 64471480.

The previous prime is 64471447. The next prime is 64471513. The reversal of 64471481 is 18417446.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62173225 + 2298256 = 7885^2 + 1516^2 .

It is a cyclic number.

It is not a de Polignac number, because 64471481 - 2⁶ = 64471417 is a prime.

It is a super-2 number, since 2×64471481² = 8313143724666722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (64471411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32235740 + 32235741.

It is an arithmetic number, because the mean of its divisors is an integer number (32235741).

Almost surely, 2^64471481 is an apocalyptic number.

It is an amenable number.

64471481 is a deficient number, since it is larger than the sum of its proper divisors (1).

64471481 is an equidigital number, since it uses as much as digits as its factorization.

64471481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21504, while the sum is 35.

The square root of 64471481 is about 8029.4134904114. The cubic root of 64471481 is about 400.9798498591.

The spelling of 64471481 in words is "sixty-four million, four hundred seventy-one thousand, four hundred eighty-one".