861180145 has 48 divisors (see below), whose sum is σ = 1273684608. Its totient is φ = 556174080.

The previous prime is 861180139. The next prime is 861180157. The reversal of 861180145 is 541081168.

It is a happy number.

It is not a de Polignac number, because 861180145 - 2³ = 861180137 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 861180145.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 376405 + ... + 378685.

It is an arithmetic number, because the mean of its divisors is an integer number (26535096).

Almost surely, 2^861180145 is an apocalyptic number.

It is an amenable number.

861180145 is a deficient number, since it is larger than the sum of its proper divisors (412504463).

861180145 is a wasteful number, since it uses less digits than its factorization.

861180145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2390 (or 2383 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 34.

The square root of 861180145 is about 29345.8710042827. The cubic root of 861180145 is about 951.4033350290.

The spelling of 861180145 in words is "eight hundred sixty-one million, one hundred eighty thousand, one hundred forty-five".