861135 has 32 divisors (see below), whose sum is σ = 1596672. Its totient is φ = 391680.

The previous prime is 861131. The next prime is 861139. The reversal of 861135 is 531168.

861135 = 413² + 414² + ... + 417².

It is an interprime number because it is at equal distance from previous prime (861131) and next prime (861139).

It is not a de Polignac number, because 861135 - 2² = 861131 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861131) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2652 + ... + 2958.

It is an arithmetic number, because the mean of its divisors is an integer number (49896).

2⁸⁶¹¹³⁵ is an apocalyptic number.

861135 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

861135 is a deficient number, since it is larger than the sum of its proper divisors (735537).

861135 is a wasteful number, since it uses less digits than its factorization.

861135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343.

The product of its digits is 720, while the sum is 24.

The square root of 861135 is about 927.9735987624. The cubic root of 861135 is about 95.1386709838.

It can be divided in two parts, 8611 and 35, that added together give a triangular number (8646 = T₁₃₁).

The spelling of 861135 in words is "eight hundred sixty-one thousand, one hundred thirty-five".