861255135 has 48 divisors (see below), whose sum is σ = 1612394784. Its totient is φ = 422758656.

The previous prime is 861255133. The next prime is 861255163. The reversal of 861255135 is 531552168.

It is a happy number.

861255135 is a `hidden beast` number, since 8 + 612 + 5 + 5 + 1 + 35 = 666.

It is not a de Polignac number, because 861255135 - 2¹ = 861255133 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 861255135.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861255133) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 216232 + ... + 220178.

It is an arithmetic number, because the mean of its divisors is an integer number (33591558).

Almost surely, 2^861255135 is an apocalyptic number.

861255135 is a deficient number, since it is larger than the sum of its proper divisors (751139649).

861255135 is a wasteful number, since it uses less digits than its factorization.

861255135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4344 (or 4341 counting only the distinct ones).

The product of its digits is 36000, while the sum is 36.

The square root of 861255135 is about 29347.1486689934. The cubic root of 861255135 is about 951.4309497179.

The spelling of 861255135 in words is "eight hundred sixty-one million, two hundred fifty-five thousand, one hundred thirty-five".