71268581 has 2 divisors, whose sum is σ = 71268582. Its totient is φ = 71268580.

The previous prime is 71268523. The next prime is 71268599. The reversal of 71268581 is 18586217.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67387681 + 3880900 = 8209^2 + 1970^2 .

It is a cyclic number.

It is not a de Polignac number, because 71268581 - 2²² = 67074277 is a prime.

It is a super-2 number, since 2×71268581² = 10158421275507122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71268521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35634290 + 35634291.

It is an arithmetic number, because the mean of its divisors is an integer number (35634291).

Almost surely, 2^71268581 is an apocalyptic number.

It is an amenable number.

71268581 is a deficient number, since it is larger than the sum of its proper divisors (1).

71268581 is an equidigital number, since it uses as much as digits as its factorization.

71268581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26880, while the sum is 38.

The square root of 71268581 is about 8442.0720797681. The cubic root of 71268581 is about 414.6032517308.

The spelling of 71268581 in words is "seventy-one million, two hundred sixty-eight thousand, five hundred eighty-one".