71000731 has 2 divisors, whose sum is σ = 71000732. Its totient is φ = 71000730.

The previous prime is 71000719. The next prime is 71000753. The reversal of 71000731 is 13700017.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (13700017) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71000731 - 2¹⁹ = 70476443 is a prime.

It is a super-2 number, since 2×71000731² = 10082207605068722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 71000699 and 71000708.

It is not a weakly prime, because it can be changed into another prime (71000791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35500365 + 35500366.

It is an arithmetic number, because the mean of its divisors is an integer number (35500366).

Almost surely, 2^71000731 is an apocalyptic number.

71000731 is a deficient number, since it is larger than the sum of its proper divisors (1).

71000731 is an equidigital number, since it uses as much as digits as its factorization.

71000731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 147, while the sum is 19.

The square root of 71000731 is about 8426.1931499343. The cubic root of 71000731 is about 414.0831960350.

Adding to 71000731 its reverse (13700017), we get a palindrome (84700748).

The spelling of 71000731 in words is "seventy-one million, seven hundred thirty-one", and thus it is an aban number.