861532235087 has 2 divisors, whose sum is σ = 861532235088. Its totient is φ = 861532235086.

The previous prime is 861532235077. The next prime is 861532235189. The reversal of 861532235087 is 780532235168.

861532235087 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 is a cyclic number.

It is not a de Polignac number, because 861532235087 - 2⁸ = 861532234831 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (861532235077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430766117543 + 430766117544.

It is an arithmetic number, because the mean of its divisors is an integer number (430766117544).

Almost surely, 2^861532235087 is an apocalyptic number.

861532235087 is a deficient number, since it is larger than the sum of its proper divisors (1).

861532235087 is an equidigital number, since it uses as much as digits as its factorization.

861532235087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2419200, while the sum is 50.

The spelling of 861532235087 in words is "eight hundred sixty-one billion, five hundred thirty-two million, two hundred thirty-five thousand, eighty-seven".