861451 has 4 divisors (see below), whose sum is σ = 882504. Its totient is φ = 840400.

The previous prime is 861439. The next prime is 861491. The reversal of 861451 is 154168.

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 861451 - 2⁹ = 860939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (861491) 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, 10465 + ... + 10546.

It is an arithmetic number, because the mean of its divisors is an integer number (220626).

2⁸⁶¹⁴⁵¹ is an apocalyptic number.

861451 is a deficient number, since it is larger than the sum of its proper divisors (21053).

861451 is a wasteful number, since it uses less digits than its factorization.

861451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21052.

The product of its digits is 960, while the sum is 25.

The square root of 861451 is about 928.1438466100. The cubic root of 861451 is about 95.1503068455.

The spelling of 861451 in words is "eight hundred sixty-one thousand, four hundred fifty-one".