861212475 has 18 divisors (see below), whose sum is σ = 1542527636. Its totient is φ = 459313200.

The previous prime is 861212459. The next prime is 861212477. The reversal of 861212475 is 574212168.

It is not a de Polignac number, because 861212475 - 2⁴ = 861212459 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (861212477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1913581 + ... + 1914030.

Almost surely, 2^861212475 is an apocalyptic number.

861212475 is a deficient number, since it is larger than the sum of its proper divisors (681315161).

861212475 is a wasteful number, since it uses less digits than its factorization.

861212475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3827627 (or 3827619 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 861212475 is about 29346.4218432163. The cubic root of 861212475 is about 951.4152405849.

The spelling of 861212475 in words is "eight hundred sixty-one million, two hundred twelve thousand, four hundred seventy-five".