71522431 has 4 divisors (see below), whose sum is σ = 71564200. Its totient is φ = 71480664.

The previous prime is 71522419. The next prime is 71522461. The reversal of 71522431 is 13422517.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 71522431 - 2⁷ = 71522303 is a prime.

It is a super-2 number, since 2×71522431² = 10230916272299522, 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 = 71522396 and 71522405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71522401) 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, 18201 + ... + 21778.

It is an arithmetic number, because the mean of its divisors is an integer number (17891050).

Almost surely, 2^71522431 is an apocalyptic number.

71522431 is a deficient number, since it is larger than the sum of its proper divisors (41769).

71522431 is a wasteful number, since it uses less digits than its factorization.

71522431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41768.

The product of its digits is 1680, while the sum is 25.

The square root of 71522431 is about 8457.0935314681. The cubic root of 71522431 is about 415.0949238516.

Adding to 71522431 its reverse (13422517), we get a palindrome (84944948).

The spelling of 71522431 in words is "seventy-one million, five hundred twenty-two thousand, four hundred thirty-one".