861261 has 4 divisors (see below), whose sum is σ = 1148352. Its totient is φ = 574172.

The previous prime is 861239. The next prime is 861293. The reversal of 861261 is 162168.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 861261 - 2¹¹ = 859213 is a prime.

It is a D-number.

It is a congruent 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, 143541 + ... + 143546.

It is an arithmetic number, because the mean of its divisors is an integer number (287088).

2⁸⁶¹²⁶¹ is an apocalyptic number.

It is an amenable number.

861261 is a deficient number, since it is larger than the sum of its proper divisors (287091).

861261 is a wasteful number, since it uses less digits than its factorization.

861261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287090.

The product of its digits is 576, while the sum is 24.

The square root of 861261 is about 928.0414861416. The cubic root of 861261 is about 95.1433109407.

The spelling of 861261 in words is "eight hundred sixty-one thousand, two hundred sixty-one".