71421587 has 4 divisors (see below), whose sum is σ = 71439216. Its totient is φ = 71403960.

The previous prime is 71421541. The next prime is 71421599. The reversal of 71421587 is 78512417.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 71421587 - 2¹⁴ = 71405203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71421787) 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, 653 + ... + 11969.

It is an arithmetic number, because the mean of its divisors is an integer number (17859804).

Almost surely, 2^71421587 is an apocalyptic number.

71421587 is a deficient number, since it is larger than the sum of its proper divisors (17629).

71421587 is a wasteful number, since it uses less digits than its factorization.

71421587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17628.

The product of its digits is 15680, while the sum is 35.

The square root of 71421587 is about 8451.1293328170. The cubic root of 71421587 is about 414.8997425593.

The spelling of 71421587 in words is "seventy-one million, four hundred twenty-one thousand, five hundred eighty-seven".