71570657 has 2 divisors, whose sum is σ = 71570658. Its totient is φ = 71570656.

The previous prime is 71570621. The next prime is 71570659. The reversal of 71570657 is 75607517.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61842496 + 9728161 = 7864^2 + 3119^2 .

It is a cyclic number.

It is not a de Polignac number, because 71570657 - 2¹⁶ = 71505121 is a prime.

Together with 71570659, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 71570657.

It is not a weakly prime, because it can be changed into another prime (71570659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35785328 + 35785329.

It is an arithmetic number, because the mean of its divisors is an integer number (35785329).

Almost surely, 2^71570657 is an apocalyptic number.

It is an amenable number.

71570657 is a deficient number, since it is larger than the sum of its proper divisors (1).

71570657 is an equidigital number, since it uses as much as digits as its factorization.

71570657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51450, while the sum is 38.

The square root of 71570657 is about 8459.9442669559. The cubic root of 71570657 is about 415.1881993452.

It can be divided in two parts, 71570 and 657, that added together give a palindrome (72227).

The spelling of 71570657 in words is "seventy-one million, five hundred seventy thousand, six hundred fifty-seven".