71045231 has 2 divisors, whose sum is σ = 71045232. Its totient is φ = 71045230.

The previous prime is 71045213. The next prime is 71045257. The reversal of 71045231 is 13254017.

Together with previous prime (71045213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 71045231 - 2⁶ = 71045167 is a prime.

It is a super-2 number, since 2×71045231² = 10094849695686722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 71045197 and 71045206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71045131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35522615 + 35522616.

It is an arithmetic number, because the mean of its divisors is an integer number (35522616).

Almost surely, 2^71045231 is an apocalyptic number.

71045231 is a deficient number, since it is larger than the sum of its proper divisors (1).

71045231 is an equidigital number, since it uses as much as digits as its factorization.

71045231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 71045231 is about 8428.8333119122. The cubic root of 71045231 is about 414.1696874163.

Adding to 71045231 its reverse (13254017), we get a palindrome (84299248).

The spelling of 71045231 in words is "seventy-one million, forty-five thousand, two hundred thirty-one".