861971293 has 2 divisors, whose sum is σ = 861971294. Its totient is φ = 861971292.

The previous prime is 861971287. The next prime is 861971303. The reversal of 861971293 is 392179168.

It is a happy number.

861971293 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 741037284 + 120934009 = 27222^2 + 10997^2 .

It is a cyclic number.

It is not a de Polignac number, because 861971293 - 2²⁹ = 325100381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (861971393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430985646 + 430985647.

It is an arithmetic number, because the mean of its divisors is an integer number (430985647).

Almost surely, 2^861971293 is an apocalyptic number.

It is an amenable number.

861971293 is a deficient number, since it is larger than the sum of its proper divisors (1).

861971293 is an equidigital number, since it uses as much as digits as its factorization.

861971293 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 46.

The square root of 861971293 is about 29359.3476255860. The cubic root of 861971293 is about 951.6945905698.

The spelling of 861971293 in words is "eight hundred sixty-one million, nine hundred seventy-one thousand, two hundred ninety-three".