861421571 has 8 divisors (see below), whose sum is σ = 870503424. Its totient is φ = 852386760.

The previous prime is 861421567. The next prime is 861421579. The reversal of 861421571 is 175124168.

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

It is a cyclic number.

It is not a de Polignac number, because 861421571 - 2² = 861421567 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (861421579) 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, 25676 + ... + 48806.

It is an arithmetic number, because the mean of its divisors is an integer number (108812928).

Almost surely, 2^861421571 is an apocalyptic number.

861421571 is a deficient number, since it is larger than the sum of its proper divisors (9081853).

861421571 is a wasteful number, since it uses less digits than its factorization.

861421571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23521.

The product of its digits is 13440, while the sum is 35.

The square root of 861421571 is about 29349.9841737606. The cubic root of 861421571 is about 951.4922332082.

The spelling of 861421571 in words is "eight hundred sixty-one million, four hundred twenty-one thousand, five hundred seventy-one".