71513243 has 2 divisors, whose sum is σ = 71513244. Its totient is φ = 71513242.

The previous prime is 71513231. The next prime is 71513261. The reversal of 71513243 is 34231517.

It is a weak prime.

It is an emirp because it is prime and its reverse (34231517) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71513243 - 2⁴ = 71513227 is a prime.

It is a super-2 number, since 2×71513243² = 10228287848754098, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (71513443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35756621 + 35756622.

It is an arithmetic number, because the mean of its divisors is an integer number (35756622).

Almost surely, 2^71513243 is an apocalyptic number.

71513243 is a deficient number, since it is larger than the sum of its proper divisors (1).

71513243 is an equidigital number, since it uses as much as digits as its factorization.

71513243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2520, while the sum is 26.

The square root of 71513243 is about 8456.5503013936. The cubic root of 71513243 is about 415.0771482837.

The spelling of 71513243 in words is "seventy-one million, five hundred thirteen thousand, two hundred forty-three".