861802769 has 2 divisors, whose sum is σ = 861802770. Its totient is φ = 861802768.

The previous prime is 861802687. The next prime is 861802807. The reversal of 861802769 is 967208168.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 859662400 + 2140369 = 29320^2 + 1463^2 .

It is a cyclic number.

It is not a de Polignac number, because 861802769 - 2¹² = 861798673 is a prime.

It is a super-2 number, since 2×861802769² = 1485408025312134722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (861862769) 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 as a sum of consecutive naturals, namely, 430901384 + 430901385.

It is an arithmetic number, because the mean of its divisors is an integer number (430901385).

Almost surely, 2^861802769 is an apocalyptic number.

It is an amenable number.

861802769 is a deficient number, since it is larger than the sum of its proper divisors (1).

861802769 is an equidigital number, since it uses as much as digits as its factorization.

861802769 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 290304, while the sum is 47.

The square root of 861802769 is about 29356.4774623932. The cubic root of 861802769 is about 951.6325645937.

The spelling of 861802769 in words is "eight hundred sixty-one million, eight hundred two thousand, seven hundred sixty-nine".