123165881 has 4 divisors (see below), whose sum is σ = 124317072. Its totient is φ = 122014692.

The previous prime is 123165869. The next prime is 123165949. The reversal of 123165881 is 188561321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 123165881 - 2⁶ = 123165817 is a prime.

It is a super-2 number, since 2×123165881² = 30339668485012322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (123165811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 575435 + ... + 575648.

It is an arithmetic number, because the mean of its divisors is an integer number (31079268).

Almost surely, 2^123165881 is an apocalyptic number.

It is an amenable number.

123165881 is a deficient number, since it is larger than the sum of its proper divisors (1151191).

123165881 is a wasteful number, since it uses less digits than its factorization.

123165881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1151190.

The product of its digits is 11520, while the sum is 35.

The square root of 123165881 is about 11098.0124797191. The cubic root of 123165881 is about 497.5424486730.

The spelling of 123165881 in words is "one hundred twenty-three million, one hundred sixty-five thousand, eight hundred eighty-one".