71428551 has 4 divisors (see below), whose sum is σ = 95238072. Its totient is φ = 47619032.

The previous prime is 71428549. The next prime is 71428559. The reversal of 71428551 is 15582417.

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 71428551 - 2¹ = 71428549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71428559) 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, 11904756 + ... + 11904761.

It is an arithmetic number, because the mean of its divisors is an integer number (23809518).

Almost surely, 2^71428551 is an apocalyptic number.

71428551 is a deficient number, since it is larger than the sum of its proper divisors (23809521).

71428551 is a wasteful number, since it uses less digits than its factorization.

71428551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23809520.

The product of its digits is 11200, while the sum is 33.

The square root of 71428551 is about 8451.5413387145. The cubic root of 71428551 is about 414.9132271281.

The spelling of 71428551 in words is "seventy-one million, four hundred twenty-eight thousand, five hundred fifty-one".