71522215 has 4 divisors (see below), whose sum is σ = 85826664. Its totient is φ = 57217768.

The previous prime is 71522197. The next prime is 71522257. The reversal of 71522215 is 51222517.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51222517 = 3631 ⋅14107.

It is a cyclic number.

It is not a de Polignac number, because 71522215 - 2¹¹ = 71520167 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71522215.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7152217 + ... + 7152226.

It is an arithmetic number, because the mean of its divisors is an integer number (21456666).

Almost surely, 2^71522215 is an apocalyptic number.

71522215 is a deficient number, since it is larger than the sum of its proper divisors (14304449).

71522215 is a wasteful number, since it uses less digits than its factorization.

71522215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14304448.

The product of its digits is 1400, while the sum is 25.

The square root of 71522215 is about 8457.0807611137. The cubic root of 71522215 is about 415.0945059846.

The spelling of 71522215 in words is "seventy-one million, five hundred twenty-two thousand, two hundred fifteen".