71217457 has 2 divisors, whose sum is σ = 71217458. Its totient is φ = 71217456.

The previous prime is 71217427. The next prime is 71217467. The reversal of 71217457 is 75471217.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51494976 + 19722481 = 7176^2 + 4441^2 .

It is a cyclic number.

It is not a de Polignac number, because 71217457 - 2⁷ = 71217329 is a prime.

It is not a weakly prime, because it can be changed into another prime (71217427) 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, 35608728 + 35608729.

It is an arithmetic number, because the mean of its divisors is an integer number (35608729).

Almost surely, 2^71217457 is an apocalyptic number.

It is an amenable number.

71217457 is a deficient number, since it is larger than the sum of its proper divisors (1).

71217457 is an equidigital number, since it uses as much as digits as its factorization.

71217457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13720, while the sum is 34.

The square root of 71217457 is about 8439.0436069498. The cubic root of 71217457 is about 414.5040904703.

The spelling of 71217457 in words is "seventy-one million, two hundred seventeen thousand, four hundred fifty-seven".