71243434 has 4 divisors (see below), whose sum is σ = 106865154. Its totient is φ = 35621716.

The previous prime is 71243429. The next prime is 71243453. The reversal of 71243434 is 43434217.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 43434217 = 1471 ⋅29527.

It can be written as a sum of positive squares in only one way, i.e., 37638225 + 33605209 = 6135^2 + 5797^2 .

It is a super-2 number, since 2×71243434² = 10151253776224712, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17810857 + ... + 17810860.

Almost surely, 2^71243434 is an apocalyptic number.

71243434 is a deficient number, since it is larger than the sum of its proper divisors (35621720).

71243434 is a wasteful number, since it uses less digits than its factorization.

71243434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35621719.

The product of its digits is 8064, while the sum is 28.

The square root of 71243434 is about 8440.5825628330. The cubic root of 71243434 is about 414.5544819722.

The spelling of 71243434 in words is "seventy-one million, two hundred forty-three thousand, four hundred thirty-four".