71323591 has 4 divisors (see below), whose sum is σ = 73624384. Its totient is φ = 69022800.

The previous prime is 71323589. The next prime is 71323597. The reversal of 71323591 is 19532317.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19532317 = 7 ⋅2790331.

It is a cyclic number.

It is not a de Polignac number, because 71323591 - 2¹ = 71323589 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 2300761 = 71323591 / (7 + 1 + 3 + 2 + 3 + 5 + 9 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71323597) 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, 1150350 + ... + 1150411.

It is an arithmetic number, because the mean of its divisors is an integer number (18406096).

Almost surely, 2^71323591 is an apocalyptic number.

71323591 is a deficient number, since it is larger than the sum of its proper divisors (2300793).

71323591 is a wasteful number, since it uses less digits than its factorization.

71323591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2300792.

The product of its digits is 5670, while the sum is 31.

The square root of 71323591 is about 8445.3295376794. The cubic root of 71323591 is about 414.7098974129.

The spelling of 71323591 in words is "seventy-one million, three hundred twenty-three thousand, five hundred ninety-one".