861622271 has 8 divisors (see below), whose sum is σ = 916401024. Its totient is φ = 807298560.

The previous prime is 861622247. The next prime is 861622273. The reversal of 861622271 is 172226168.

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 861622271 - 2⁶ = 861622207 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 (861622273) 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, 109850 + ... + 117431.

It is an arithmetic number, because the mean of its divisors is an integer number (114550128).

Almost surely, 2^861622271 is an apocalyptic number.

861622271 is a deficient number, since it is larger than the sum of its proper divisors (54778753).

861622271 is a wasteful number, since it uses less digits than its factorization.

861622271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227521.

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

The square root of 861622271 is about 29353.4030565452. The cubic root of 861622271 is about 951.5661225669.

The spelling of 861622271 in words is "eight hundred sixty-one million, six hundred twenty-two thousand, two hundred seventy-one".