71553481 has 2 divisors, whose sum is σ = 71553482. Its totient is φ = 71553480.

The previous prime is 71553479. The next prime is 71553509. The reversal of 71553481 is 18435517.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52925625 + 18627856 = 7275^2 + 4316^2 .

It is a cyclic number.

It is not a de Polignac number, because 71553481 - 2¹ = 71553479 is a prime.

It is a super-2 number, since 2×71553481² = 10239801286434722, which contains 22 as substring.

Together with 71553479, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (71553401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35776740 + 35776741.

It is an arithmetic number, because the mean of its divisors is an integer number (35776741).

Almost surely, 2^71553481 is an apocalyptic number.

It is an amenable number.

71553481 is a deficient number, since it is larger than the sum of its proper divisors (1).

71553481 is an equidigital number, since it uses as much as digits as its factorization.

71553481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16800, while the sum is 34.

The square root of 71553481 is about 8458.9290693326. The cubic root of 71553481 is about 415.1549834839.

Adding to 71553481 its reverse (18435517), we get a palindrome (89988998).

The spelling of 71553481 in words is "seventy-one million, five hundred fifty-three thousand, four hundred eighty-one".