71521842 has 16 divisors (see below), whose sum is σ = 163478592. Its totient is φ = 20434800.

The previous prime is 71521799. The next prime is 71521843. The reversal of 71521842 is 24812517.

It is not an unprimeable number, because it can be changed into a prime (71521843) 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 7 ways as a sum of consecutive naturals, for example, 851409 + ... + 851492.

It is an arithmetic number, because the mean of its divisors is an integer number (10217412).

Almost surely, 2^71521842 is an apocalyptic number.

71521842 is an abundant number, since it is smaller than the sum of its proper divisors (91956750).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71521842 is a wasteful number, since it uses less digits than its factorization.

71521842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1702913.

The product of its digits is 4480, while the sum is 30.

The square root of 71521842 is about 8457.0587085582. The cubic root of 71521842 is about 415.0937843882.

The spelling of 71521842 in words is "seventy-one million, five hundred twenty-one thousand, eight hundred forty-two".