861355 has 8 divisors (see below), whose sum is σ = 1127664. Its totient is φ = 626400.

The previous prime is 861353. The next prime is 861361. The reversal of 861355 is 553168.

861355 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 861355 - 2¹ = 861353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (861353) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7776 + ... + 7885.

It is an arithmetic number, because the mean of its divisors is an integer number (140958).

2⁸⁶¹³⁵⁵ is an apocalyptic number.

861355 is a deficient number, since it is larger than the sum of its proper divisors (266309).

861355 is a wasteful number, since it uses less digits than its factorization.

861355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15677.

The product of its digits is 3600, while the sum is 28.

The square root of 861355 is about 928.0921290475. The cubic root of 861355 is about 95.1467722011.

It can be divided in two parts, 8613 and 55, that added together give a palindrome (8668).

The spelling of 861355 in words is "eight hundred sixty-one thousand, three hundred fifty-five".