71220871 has 6 divisors (see below), whose sum is σ = 75657080. Its totient is φ = 67031136.

The previous prime is 71220859. The next prime is 71220883. The reversal of 71220871 is 17802217.

It is an interprime number because it is at equal distance from previous prime (71220859) and next prime (71220883).

It is a de Polignac number, because none of the positive numbers 2^k-71220871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71220971) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 122931 + ... + 123508.

Almost surely, 2^71220871 is an apocalyptic number.

71220871 is a deficient number, since it is larger than the sum of its proper divisors (4436209).

71220871 is a wasteful number, since it uses less digits than its factorization.

71220871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246473 (or 246456 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 28.

The square root of 71220871 is about 8439.2458786316. The cubic root of 71220871 is about 414.5107138200.

The spelling of 71220871 in words is "seventy-one million, two hundred twenty thousand, eight hundred seventy-one".