920861 has 4 divisors (see below), whose sum is σ = 924924. Its totient is φ = 916800.

The previous prime is 920849. The next prime is 920863. The reversal of 920861 is 168029.

920861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 765625 + 155236 = 875^2 + 394^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-920861 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 920861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (920863) 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, 1670 + ... + 2151.

It is an arithmetic number, because the mean of its divisors is an integer number (231231).

2⁹²⁰⁸⁶¹ is an apocalyptic number.

It is an amenable number.

920861 is a deficient number, since it is larger than the sum of its proper divisors (4063).

920861 is a wasteful number, since it uses less digits than its factorization.

920861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4062.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 920861 is about 959.6150269770. The cubic root of 920861 is about 97.2892137046.

The spelling of 920861 in words is "nine hundred twenty thousand, eight hundred sixty-one".