861251 has 4 divisors (see below), whose sum is σ = 906600. Its totient is φ = 815904.

The previous prime is 861239. The next prime is 861293. The reversal of 861251 is 152168.

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 861251 - 2¹⁴ = 844867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (861221) 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, 22646 + ... + 22683.

It is an arithmetic number, because the mean of its divisors is an integer number (226650).

2⁸⁶¹²⁵¹ is an apocalyptic number.

861251 is a deficient number, since it is larger than the sum of its proper divisors (45349).

861251 is a wasteful number, since it uses less digits than its factorization.

861251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45348.

The product of its digits is 480, while the sum is 23.

The square root of 861251 is about 928.0360984358. The cubic root of 861251 is about 95.1429427067.

The spelling of 861251 in words is "eight hundred sixty-one thousand, two hundred fifty-one".