71331473 has 4 divisors (see below), whose sum is σ = 75527460. Its totient is φ = 67135488.

The previous prime is 71331461. The next prime is 71331479. The reversal of 71331473 is 37413317.

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

It can be written as a sum of positive squares in 2 ways, for example, as 47789569 + 23541904 = 6913^2 + 4852^2 .

It is a cyclic number.

It is not a de Polignac number, because 71331473 - 2⁴ = 71331457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71331479) 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, 2097968 + ... + 2098001.

It is an arithmetic number, because the mean of its divisors is an integer number (18881865).

Almost surely, 2^71331473 is an apocalyptic number.

It is an amenable number.

71331473 is a deficient number, since it is larger than the sum of its proper divisors (4195987).

71331473 is a wasteful number, since it uses less digits than its factorization.

71331473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4195986.

The product of its digits is 5292, while the sum is 29.

The square root of 71331473 is about 8445.7961732450. The cubic root of 71331473 is about 414.7251734385.

The spelling of 71331473 in words is "seventy-one million, three hundred thirty-one thousand, four hundred seventy-three".