861017393 has 12 divisors (see below), whose sum is σ = 882802980. Its totient is φ = 839755392.

The previous prime is 861017371. The next prime is 861017413. The reversal of 861017393 is 393710168.

It can be written as a sum of positive squares in 2 ways, for example, as 599613169 + 261404224 = 24487^2 + 16168^2 .

It is not a de Polignac number, because 861017393 - 2⁸ = 861017137 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 (861017323) 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 11 ways as a sum of consecutive naturals, for example, 903005 + ... + 903957.

It is an arithmetic number, because the mean of its divisors is an integer number (73566915).

Almost surely, 2^861017393 is an apocalyptic number.

It is an amenable number.

861017393 is a deficient number, since it is larger than the sum of its proper divisors (21785587).

861017393 is an equidigital number, since it uses as much as digits as its factorization.

861017393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1456 (or 1409 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 861017393 is about 29343.0978766728. The cubic root of 861017393 is about 951.3433969112.

The spelling of 861017393 in words is "eight hundred sixty-one million, seventeen thousand, three hundred ninety-three".