201123504 has 30 divisors (see below), whose sum is σ = 562866876. Its totient is φ = 67041120.

The previous prime is 201123479. The next prime is 201123509. The reversal of 201123504 is 405321102.

It is a super-2 number, since 2×201123504² = 80901327722476032, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (201123509) 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 5 ways as a sum of consecutive naturals, for example, 698202 + ... + 698489.

Almost surely, 2^201123504 is an apocalyptic number.

201123504 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

201123504 is an abundant number, since it is smaller than the sum of its proper divisors (361743372).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

201123504 is a wasteful number, since it uses less digits than its factorization.

201123504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1396705 (or 1396696 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 201123504 is about 14181.8018601305. The cubic root of 201123504 is about 585.8965520739.

Adding to 201123504 its reverse (405321102), we get a palindrome (606444606).

The spelling of 201123504 in words is "two hundred one million, one hundred twenty-three thousand, five hundred four".