861511079 has 8 divisors (see below), whose sum is σ = 1012125072. Its totient is φ = 722946240.

The previous prime is 861511067. The next prime is 861511087. The reversal of 861511079 is 970115168.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 861511079 - 2⁸ = 861510823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861511009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3012134 + ... + 3012419.

It is an arithmetic number, because the mean of its divisors is an integer number (126515634).

Almost surely, 2^861511079 is an apocalyptic number.

861511079 is a deficient number, since it is larger than the sum of its proper divisors (150613993).

861511079 is a wasteful number, since it uses less digits than its factorization.

861511079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6024577.

The product of its (nonzero) digits is 15120, while the sum is 38.

The square root of 861511079 is about 29351.5089731346. The cubic root of 861511079 is about 951.5251877337.

The spelling of 861511079 in words is "eight hundred sixty-one million, five hundred eleven thousand, seventy-nine".