71870657 has 2 divisors, whose sum is σ = 71870658. Its totient is φ = 71870656.

The previous prime is 71870633. The next prime is 71870677. The reversal of 71870657 is 75607817.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71639296 + 231361 = 8464^2 + 481^2 .

It is an emirp because it is prime and its reverse (75607817) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71870657 is a prime.

It is a super-2 number, since 2×71870657² = 10330782675223298, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71870677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35935328 + 35935329.

It is an arithmetic number, because the mean of its divisors is an integer number (35935329).

Almost surely, 2^71870657 is an apocalyptic number.

It is an amenable number.

71870657 is a deficient number, since it is larger than the sum of its proper divisors (1).

71870657 is an equidigital number, since it uses as much as digits as its factorization.

71870657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82320, while the sum is 41.

The square root of 71870657 is about 8477.6563388710. The cubic root of 71870657 is about 415.7675002128.

It can be divided in two parts, 71870 and 657, that added together give a palindrome (72527).

The spelling of 71870657 in words is "seventy-one million, eight hundred seventy thousand, six hundred fifty-seven".