71889481 has 4 divisors (see below), whose sum is σ = 76118292. Its totient is φ = 67660672.

The previous prime is 71889469. The next prime is 71889487. The reversal of 71889481 is 18498817.

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 47485881 + 24403600 = 6891^2 + 4940^2 .

It is a cyclic number.

It is not a de Polignac number, because 71889481 - 2⁷ = 71889353 is a prime.

It is a super-2 number, since 2×71889481² = 10336194956898722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71889487) 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, 2114380 + ... + 2114413.

It is an arithmetic number, because the mean of its divisors is an integer number (19029573).

Almost surely, 2^71889481 is an apocalyptic number.

It is an amenable number.

71889481 is a deficient number, since it is larger than the sum of its proper divisors (4228811).

71889481 is a wasteful number, since it uses less digits than its factorization.

71889481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4228810.

The product of its digits is 129024, while the sum is 46.

The square root of 71889481 is about 8478.7664786807. The cubic root of 71889481 is about 415.8037956198.

The spelling of 71889481 in words is "seventy-one million, eight hundred eighty-nine thousand, four hundred eighty-one".