71255531 has 4 divisors (see below), whose sum is σ = 71275200. Its totient is φ = 71235864.

The previous prime is 71255497. The next prime is 71255557. The reversal of 71255531 is 13555217.

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: 13555217 = 13 ⋅1042709.

It is a cyclic number.

It is not a de Polignac number, because 71255531 - 2⁶ = 71255467 is a prime.

It is a super-2 number, since 2×71255531² = 10154701396183922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71255494 and 71255503.

It is not an unprimeable number, because it can be changed into a prime (71215531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2651 + ... + 12228.

It is an arithmetic number, because the mean of its divisors is an integer number (17818800).

Almost surely, 2^71255531 is an apocalyptic number.

71255531 is a deficient number, since it is larger than the sum of its proper divisors (19669).

71255531 is a wasteful number, since it uses less digits than its factorization.

71255531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19668.

The product of its digits is 5250, while the sum is 29.

The square root of 71255531 is about 8441.2991298733. The cubic root of 71255531 is about 414.5779441659.

The spelling of 71255531 in words is "seventy-one million, two hundred fifty-five thousand, five hundred thirty-one".