857142521 has 8 divisors (see below), whose sum is σ = 877534944. Its totient is φ = 836771040.

The previous prime is 857142409. The next prime is 857142523. The reversal of 857142521 is 125241758.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-857142521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (857142523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104450 + ... + 112356.

It is an arithmetic number, because the mean of its divisors is an integer number (109691868).

Almost surely, 2^857142521 is an apocalyptic number.

It is an amenable number.

857142521 is a deficient number, since it is larger than the sum of its proper divisors (20392423).

857142521 is a wasteful number, since it uses less digits than its factorization.

857142521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10471.

The product of its digits is 22400, while the sum is 35.

The square root of 857142521 is about 29276.9964477233. The cubic root of 857142521 is about 949.9141274181.

The spelling of 857142521 in words is "eight hundred fifty-seven million, one hundred forty-two thousand, five hundred twenty-one".