71256506 has 4 divisors (see below), whose sum is σ = 106884762. Its totient is φ = 35628252.

The previous prime is 71256473. The next prime is 71256511. The reversal of 71256506 is 60565217.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60565217 = 19 ⋅3187643.

It can be written as a sum of positive squares in only one way, i.e., 66569281 + 4687225 = 8159^2 + 2165^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17814125 + ... + 17814128.

Almost surely, 2^71256506 is an apocalyptic number.

71256506 is a deficient number, since it is larger than the sum of its proper divisors (35628256).

71256506 is a wasteful number, since it uses less digits than its factorization.

71256506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35628255.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 71256506 is about 8441.3568814498. The cubic root of 71256506 is about 414.5798350678.

It can be divided in two parts, 7125 and 6506, that added together give a palindrome (13631).

The spelling of 71256506 in words is "seventy-one million, two hundred fifty-six thousand, five hundred six".