851579551 has 4 divisors (see below), whose sum is σ = 857295000. Its totient is φ = 845864104.

The previous prime is 851579549. The next prime is 851579557. The reversal of 851579551 is 155975158.

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 851579551 - 2¹ = 851579549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (851579557) 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, 2857501 + ... + 2857798.

It is an arithmetic number, because the mean of its divisors is an integer number (214323750).

Almost surely, 2^851579551 is an apocalyptic number.

851579551 is a deficient number, since it is larger than the sum of its proper divisors (5715449).

851579551 is a wasteful number, since it uses less digits than its factorization.

851579551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5715448.

The product of its digits is 315000, while the sum is 46.

The square root of 851579551 is about 29181.8359771965. The cubic root of 851579551 is about 947.8546421337.

The spelling of 851579551 in words is "eight hundred fifty-one million, five hundred seventy-nine thousand, five hundred fifty-one".