861098159 has 2 divisors, whose sum is σ = 861098160. Its totient is φ = 861098158.

The previous prime is 861098149. The next prime is 861098167. The reversal of 861098159 is 951890168.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-861098159 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (861098149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430549079 + 430549080.

It is an arithmetic number, because the mean of its divisors is an integer number (430549080).

Almost surely, 2^861098159 is an apocalyptic number.

861098159 is a deficient number, since it is larger than the sum of its proper divisors (1).

861098159 is an equidigital number, since it uses as much as digits as its factorization.

861098159 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 155520, while the sum is 47.

The square root of 861098159 is about 29344.4740794583. The cubic root of 861098159 is about 951.3731422640.

The spelling of 861098159 in words is "eight hundred sixty-one million, ninety-eight thousand, one hundred fifty-nine".