71529891 has 4 divisors (see below), whose sum is σ = 95373192. Its totient is φ = 47686592.

The previous prime is 71529883. The next prime is 71529893. The reversal of 71529891 is 19892517.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19892517 = 3 ⋅6630839.

It is a cyclic number.

It is not a de Polignac number, because 71529891 - 2³ = 71529883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71529893) 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, 11921646 + ... + 11921651.

It is an arithmetic number, because the mean of its divisors is an integer number (23843298).

Almost surely, 2^71529891 is an apocalyptic number.

71529891 is a deficient number, since it is larger than the sum of its proper divisors (23843301).

71529891 is a wasteful number, since it uses less digits than its factorization.

71529891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23843300.

The product of its digits is 45360, while the sum is 42.

The square root of 71529891 is about 8457.5345698377. The cubic root of 71529891 is about 415.1093552238.

The spelling of 71529891 in words is "seventy-one million, five hundred twenty-nine thousand, eight hundred ninety-one".