71398771 has 4 divisors (see below), whose sum is σ = 71503992. Its totient is φ = 71293552.

The previous prime is 71398763. The next prime is 71398777. The reversal of 71398771 is 17789317.

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 71398771 - 2³ = 71398763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71398777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51586 + ... + 52951.

It is an arithmetic number, because the mean of its divisors is an integer number (17875998).

Almost surely, 2^71398771 is an apocalyptic number.

71398771 is a deficient number, since it is larger than the sum of its proper divisors (105221).

71398771 is a wasteful number, since it uses less digits than its factorization.

71398771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105220.

The product of its digits is 74088, while the sum is 43.

The square root of 71398771 is about 8449.7793462315. The cubic root of 71398771 is about 414.8555572220.

The spelling of 71398771 in words is "seventy-one million, three hundred ninety-eight thousand, seven hundred seventy-one".