861412187 has 2 divisors, whose sum is σ = 861412188. Its totient is φ = 861412186.

The previous prime is 861412157. The next prime is 861412199. The reversal of 861412187 is 781214168.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-861412187 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 861412187.

It is not a weakly prime, because it can be changed into another prime (861412157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430706093 + 430706094.

It is an arithmetic number, because the mean of its divisors is an integer number (430706094).

Almost surely, 2^861412187 is an apocalyptic number.

861412187 is a deficient number, since it is larger than the sum of its proper divisors (1).

861412187 is an equidigital number, since it uses as much as digits as its factorization.

861412187 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21504, while the sum is 38.

The square root of 861412187 is about 29349.8243095253. The cubic root of 861412187 is about 951.4887781305.

The spelling of 861412187 in words is "eight hundred sixty-one million, four hundred twelve thousand, one hundred eighty-seven".