861011123 has 8 divisors (see below), whose sum is σ = 988131840. Its totient is φ = 734920200.

The previous prime is 861011119. The next prime is 861011147. The reversal of 861011123 is 321110168.

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

It is not a de Polignac number, because 861011123 - 2² = 861011119 is a prime.

It is a super-2 number, since 2×861011123² = 1482680307859442258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (861011623) 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, 255653 + ... + 258998.

It is an arithmetic number, because the mean of its divisors is an integer number (123516480).

Almost surely, 2^861011123 is an apocalyptic number.

861011123 is a deficient number, since it is larger than the sum of its proper divisors (127120717).

861011123 is a wasteful number, since it uses less digits than its factorization.

861011123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514897.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 861011123 is about 29342.9910370432. The cubic root of 861011123 is about 951.3410876518.

The spelling of 861011123 in words is "eight hundred sixty-one million, eleven thousand, one hundred twenty-three".