201123131 has 16 divisors (see below), whose sum is σ = 222432000. Its totient is φ = 180338400.

The previous prime is 201123127. The next prime is 201123137. The reversal of 201123131 is 131321102.

It is not a de Polignac number, because 201123131 - 2² = 201123127 is a prime.

It is a super-2 number, since 2×201123131² = 80901027646486322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201123137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 303941 + ... + 304601.

It is an arithmetic number, because the mean of its divisors is an integer number (13902000).

Almost surely, 2^201123131 is an apocalyptic number.

201123131 is a deficient number, since it is larger than the sum of its proper divisors (21308869).

201123131 is a wasteful number, since it uses less digits than its factorization.

201123131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1010.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 201123131 is about 14181.7887094682. The cubic root of 201123131 is about 585.8961898760.

Adding to 201123131 its reverse (131321102), we get a palindrome (332444233).

The spelling of 201123131 in words is "two hundred one million, one hundred twenty-three thousand, one hundred thirty-one".