861961 has 4 divisors (see below), whose sum is σ = 864000. Its totient is φ = 859924.

The previous prime is 861947. The next prime is 861977. The reversal of 861961 is 169168.

It is a happy number.

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 861961 - 2⁵ = 861929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (861901) 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, 121 + ... + 1318.

It is an arithmetic number, because the mean of its divisors is an integer number (216000).

2⁸⁶¹⁹⁶¹ is an apocalyptic number.

It is an amenable number.

861961 is a deficient number, since it is larger than the sum of its proper divisors (2039).

861961 is a wasteful number, since it uses less digits than its factorization.

861961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2038.

The product of its digits is 2592, while the sum is 31.

The square root of 861961 is about 928.4185478544. The cubic root of 861961 is about 95.1690802419.

The spelling of 861961 in words is "eight hundred sixty-one thousand, nine hundred sixty-one".