71216155 has 4 divisors (see below), whose sum is σ = 85459392. Its totient is φ = 56972920.

The previous prime is 71216149. The next prime is 71216183. The reversal of 71216155 is 55161217.

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

It is not a de Polignac number, because 71216155 - 2³ = 71216147 is a prime.

It is a Duffinian 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, 7121611 + ... + 7121620.

It is an arithmetic number, because the mean of its divisors is an integer number (21364848).

Almost surely, 2^71216155 is an apocalyptic number.

71216155 is a deficient number, since it is larger than the sum of its proper divisors (14243237).

71216155 is a wasteful number, since it uses less digits than its factorization.

71216155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14243236.

The product of its digits is 2100, while the sum is 28.

The square root of 71216155 is about 8438.9664651544. The cubic root of 71216155 is about 414.5015644623.

The spelling of 71216155 in words is "seventy-one million, two hundred sixteen thousand, one hundred fifty-five".