123011131 has 8 divisors (see below), whose sum is σ = 127718784. Its totient is φ = 118349760.

The previous prime is 123011117. The next prime is 123011143. The reversal of 123011131 is 131110321.

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 123011131 - 2¹⁷ = 122880059 is a prime.

It is a super-2 number, since 2×123011131² = 30263476699798322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123011171) 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, 6106 + ... + 16831.

It is an arithmetic number, because the mean of its divisors is an integer number (15964848).

Almost surely, 2^123011131 is an apocalyptic number.

123011131 is a deficient number, since it is larger than the sum of its proper divisors (4707653).

123011131 is a wasteful number, since it uses less digits than its factorization.

123011131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23141.

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 123011131 is about 11091.0383192918. The cubic root of 123011131 is about 497.3339846565. Note that the first 3 decimals are identical.

Adding to 123011131 its reverse (131110321), we get a palindrome (254121452).

The spelling of 123011131 in words is "one hundred twenty-three million, eleven thousand, one hundred thirty-one".