71532861 has 4 divisors (see below), whose sum is σ = 95377152. Its totient is φ = 47688572.

The previous prime is 71532847. The next prime is 71532863. The reversal of 71532861 is 16823517.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16823517 = 3 ⋅5607839.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71532861 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71532863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11922141 + ... + 11922146.

It is an arithmetic number, because the mean of its divisors is an integer number (23844288).

Almost surely, 2^71532861 is an apocalyptic number.

It is an amenable number.

71532861 is a deficient number, since it is larger than the sum of its proper divisors (23844291).

71532861 is a wasteful number, since it uses less digits than its factorization.

71532861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23844290.

The product of its digits is 10080, while the sum is 33.

The square root of 71532861 is about 8457.7101510988. The cubic root of 71532861 is about 415.1151004105.

The spelling of 71532861 in words is "seventy-one million, five hundred thirty-two thousand, eight hundred sixty-one".