861275487 has 4 divisors (see below), whose sum is σ = 1148367320. Its totient is φ = 574183656.

The previous prime is 861275477. The next prime is 861275521. The reversal of 861275487 is 784572168.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 861275487 - 2⁸ = 861275231 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861275407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143545912 + ... + 143545917.

It is an arithmetic number, because the mean of its divisors is an integer number (287091830).

Almost surely, 2^861275487 is an apocalyptic number.

861275487 is a deficient number, since it is larger than the sum of its proper divisors (287091833).

861275487 is a wasteful number, since it uses less digits than its factorization.

861275487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287091832.

The product of its digits is 752640, while the sum is 48.

The square root of 861275487 is about 29347.4954127264. The cubic root of 861275487 is about 951.4384439626.

The spelling of 861275487 in words is "eight hundred sixty-one million, two hundred seventy-five thousand, four hundred eighty-seven".