861929 has 2 divisors, whose sum is σ = 861930. Its totient is φ = 861928.

The previous prime is 861907. The next prime is 861937. The reversal of 861929 is 929168.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 851929 + 10000 = 923^2 + 100^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-861929 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (861979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430964 + 430965.

It is an arithmetic number, because the mean of its divisors is an integer number (430965).

2⁸⁶¹⁹²⁹ is an apocalyptic number.

It is an amenable number.

861929 is a deficient number, since it is larger than the sum of its proper divisors (1).

861929 is an equidigital number, since it uses as much as digits as its factorization.

861929 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 35.

The square root of 861929 is about 928.4013140878. The cubic root of 861929 is about 95.1679025211.

The spelling of 861929 in words is "eight hundred sixty-one thousand, nine hundred twenty-nine".