861529087 has 2 divisors, whose sum is σ = 861529088. Its totient is φ = 861529086.

The previous prime is 861529079. The next prime is 861529093. The reversal of 861529087 is 780925168.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 861529087 - 2³ = 861529079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (831529087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430764543 + 430764544.

It is an arithmetic number, because the mean of its divisors is an integer number (430764544).

Almost surely, 2^861529087 is an apocalyptic number.

861529087 is a deficient number, since it is larger than the sum of its proper divisors (1).

861529087 is an equidigital number, since it uses as much as digits as its factorization.

861529087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 241920, while the sum is 46.

The square root of 861529087 is about 29351.8157359983. The cubic root of 861529087 is about 951.5318175367.

The spelling of 861529087 in words is "eight hundred sixty-one million, five hundred twenty-nine thousand, eighty-seven".