123121131 has 16 divisors (see below), whose sum is σ = 188285184. Its totient is φ = 70102944.

The previous prime is 123121129. The next prime is 123121133. The reversal of 123121131 is 131121321.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (123121129) and next prime (123121133).

It is not a de Polignac number, because 123121131 - 2¹ = 123121129 is a prime.

It is a super-2 number, since 2×123121131² = 30317625797438322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 123121131.

It is not an unprimeable number, because it can be changed into a prime (123121133) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4416 + ... + 16301.

It is an arithmetic number, because the mean of its divisors is an integer number (11767824).

Almost surely, 2^123121131 is an apocalyptic number.

123121131 is a deficient number, since it is larger than the sum of its proper divisors (65164053).

123121131 is a wasteful number, since it uses less digits than its factorization.

123121131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21010.

The product of its digits is 36, while the sum is 15.

The square root of 123121131 is about 11095.9961697903. The cubic root of 123121131 is about 497.4821838186.

Adding to 123121131 its reverse (131121321), we get a palindrome (254242452).

The spelling of 123121131 in words is "one hundred twenty-three million, one hundred twenty-one thousand, one hundred thirty-one".