861101039 has 2 divisors, whose sum is σ = 861101040. Its totient is φ = 861101038.

The previous prime is 861101029. The next prime is 861101041. The reversal of 861101039 is 930101168.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 861101039 - 2⁴ = 861101023 is a prime.

Together with 861101041, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (861101009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430550519 + 430550520.

It is an arithmetic number, because the mean of its divisors is an integer number (430550520).

Almost surely, 2^861101039 is an apocalyptic number.

861101039 is a deficient number, since it is larger than the sum of its proper divisors (1).

861101039 is an equidigital number, since it uses as much as digits as its factorization.

861101039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 861101039 is about 29344.5231516888. The cubic root of 861101039 is about 951.3742029064.

The spelling of 861101039 in words is "eight hundred sixty-one million, one hundred one thousand, thirty-nine".