861275745 has 24 divisors (see below), whose sum is σ = 1628595072. Its totient is φ = 417588000.

The previous prime is 861275741. The next prime is 861275761. The reversal of 861275745 is 547572168.

It is not a de Polignac number, because 861275745 - 2² = 861275741 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 861275745.

It is not an unprimeable number, because it can be changed into a prime (861275741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 869481 + ... + 870470.

It is an arithmetic number, because the mean of its divisors is an integer number (67858128).

Almost surely, 2^861275745 is an apocalyptic number.

It is an amenable number.

861275745 is a deficient number, since it is larger than the sum of its proper divisors (767319327).

861275745 is a wasteful number, since it uses less digits than its factorization.

861275745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1739973 (or 1739970 counting only the distinct ones).

The product of its digits is 470400, while the sum is 45.

The square root of 861275745 is about 29347.4998083312. The cubic root of 861275745 is about 951.4385389655.

The spelling of 861275745 in words is "eight hundred sixty-one million, two hundred seventy-five thousand, seven hundred forty-five".