123015871 has 4 divisors (see below), whose sum is σ = 134199144. Its totient is φ = 111832600.

The previous prime is 123015863. The next prime is 123015881. The reversal of 123015871 is 178510321.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 123015871 - 2³ = 123015863 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 (123015811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5591620 + ... + 5591641.

It is an arithmetic number, because the mean of its divisors is an integer number (33549786).

Almost surely, 2^123015871 is an apocalyptic number.

123015871 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

123015871 is a deficient number, since it is larger than the sum of its proper divisors (11183273).

123015871 is a wasteful number, since it uses less digits than its factorization.

123015871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11183272.

The product of its (nonzero) digits is 1680, while the sum is 28.

The square root of 123015871 is about 11091.2520032682. The cubic root of 123015871 is about 497.3403725142.

The spelling of 123015871 in words is "one hundred twenty-three million, fifteen thousand, eight hundred seventy-one".