861479261 has 2 divisors, whose sum is σ = 861479262. Its totient is φ = 861479260.

The previous prime is 861479123. The next prime is 861479291. The reversal of 861479261 is 162974168.

861479261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 672416761 + 189062500 = 25931^2 + 13750^2 .

It is a cyclic number.

It is not a de Polignac number, because 861479261 - 2¹⁸ = 861217117 is a prime.

It is a super-2 number, since 2×861479261² = 1484293034266212242, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (861479291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430739630 + 430739631.

It is an arithmetic number, because the mean of its divisors is an integer number (430739631).

Almost surely, 2^861479261 is an apocalyptic number.

It is an amenable number.

861479261 is a deficient number, since it is larger than the sum of its proper divisors (1).

861479261 is an equidigital number, since it uses as much as digits as its factorization.

861479261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 44.

The square root of 861479261 is about 29350.9669517037. The cubic root of 861479261 is about 951.5134734323.

The spelling of 861479261 in words is "eight hundred sixty-one million, four hundred seventy-nine thousand, two hundred sixty-one".