71257441 has 2 divisors, whose sum is σ = 71257442. Its totient is φ = 71257440.

The previous prime is 71257393. The next prime is 71257453. The reversal of 71257441 is 14475217.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66830625 + 4426816 = 8175^2 + 2104^2 .

It is an emirp because it is prime and its reverse (14475217) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71257441 - 2¹³ = 71249249 is a prime.

It is not a weakly prime, because it can be changed into another prime (71257471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35628720 + 35628721.

It is an arithmetic number, because the mean of its divisors is an integer number (35628721).

Almost surely, 2^71257441 is an apocalyptic number.

It is an amenable number.

71257441 is a deficient number, since it is larger than the sum of its proper divisors (1).

71257441 is an equidigital number, since it uses as much as digits as its factorization.

71257441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7840, while the sum is 31.

The square root of 71257441 is about 8441.4122633597. The cubic root of 71257441 is about 414.5816483780.

The spelling of 71257441 in words is "seventy-one million, two hundred fifty-seven thousand, four hundred forty-one".