861275477 has 2 divisors, whose sum is σ = 861275478. Its totient is φ = 861275476.

The previous prime is 861275407. The next prime is 861275521. The reversal of 861275477 is 774572168.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 845704561 + 15570916 = 29081^2 + 3946^2 .

It is a cyclic number.

It is not a de Polignac number, because 861275477 - 2¹⁴ = 861259093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (861275407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430637738 + 430637739.

It is an arithmetic number, because the mean of its divisors is an integer number (430637739).

Almost surely, 2^861275477 is an apocalyptic number.

It is an amenable number.

861275477 is a deficient number, since it is larger than the sum of its proper divisors (1).

861275477 is an equidigital number, since it uses as much as digits as its factorization.

861275477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 658560, while the sum is 47.

The square root of 861275477 is about 29347.4952423542. The cubic root of 861275477 is about 951.4384402803.

The spelling of 861275477 in words is "eight hundred sixty-one million, two hundred seventy-five thousand, four hundred seventy-seven".