869961 has 4 divisors (see below), whose sum is σ = 1159952. Its totient is φ = 579972.

The previous prime is 869959. The next prime is 869983. The reversal of 869961 is 169968.

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 not a de Polignac number, because 869961 - 2¹ = 869959 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (869951) 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, 144991 + ... + 144996.

It is an arithmetic number, because the mean of its divisors is an integer number (289988).

2⁸⁶⁹⁹⁶¹ is an apocalyptic number.

It is an amenable number.

869961 is a deficient number, since it is larger than the sum of its proper divisors (289991).

869961 is a wasteful number, since it uses less digits than its factorization.

869961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289990.

The product of its digits is 23328, while the sum is 39.

The square root of 869961 is about 932.7169988802. The cubic root of 869961 is about 95.4626005983.

It can be divided in two parts, 869 and 961, that added together give a triangular number (1830 = T₆₀).

The spelling of 869961 in words is "eight hundred sixty-nine thousand, nine hundred sixty-one".