71522257 has 2 divisors, whose sum is σ = 71522258. Its totient is φ = 71522256.

The previous prime is 71522197. The next prime is 71522267. The reversal of 71522257 is 75222517.

71522257 is nontrivially palindromic in base 14.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40564161 + 30958096 = 6369^2 + 5564^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71522257 is a prime.

It is not a weakly prime, because it can be changed into another prime (71522267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35761128 + 35761129.

It is an arithmetic number, because the mean of its divisors is an integer number (35761129).

Almost surely, 2^71522257 is an apocalyptic number.

It is an amenable number.

71522257 is a deficient number, since it is larger than the sum of its proper divisors (1).

71522257 is an equidigital number, since it uses as much as digits as its factorization.

71522257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9800, while the sum is 31.

The square root of 71522257 is about 8457.0832442397. The cubic root of 71522257 is about 415.0945872366.

It can be divided in two parts, 7152 and 2257, that added together give a square (9409 = 97²).

The spelling of 71522257 in words is "seventy-one million, five hundred twenty-two thousand, two hundred fifty-seven".