861406271 has 16 divisors (see below), whose sum is σ = 965357568. Its totient is φ = 761925600.

The previous prime is 861406261. The next prime is 861406277. The reversal of 861406271 is 172604168.

It is a cyclic number.

It is not a de Polignac number, because 861406271 - 2¹⁰ = 861405247 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 (861406277) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84626 + ... + 94256.

It is an arithmetic number, because the mean of its divisors is an integer number (60334848).

Almost surely, 2^861406271 is an apocalyptic number.

861406271 is a deficient number, since it is larger than the sum of its proper divisors (103951297).

861406271 is a wasteful number, since it uses less digits than its factorization.

861406271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9862.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 861406271 is about 29349.7235251033. The cubic root of 861406271 is about 951.4865999164.

The spelling of 861406271 in words is "eight hundred sixty-one million, four hundred six thousand, two hundred seventy-one".