203120001 has 16 divisors (see below), whose sum is σ = 343907200. Its totient is φ = 116068464.

The previous prime is 203119997. The next prime is 203120011. The reversal of 203120001 is 100021302.

It is a happy number.

It is not a de Polignac number, because 203120001 - 2² = 203119997 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (203120011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 537166 + ... + 537543.

It is an arithmetic number, because the mean of its divisors is an integer number (21494200).

Almost surely, 2^203120001 is an apocalyptic number.

203120001 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

203120001 is a deficient number, since it is larger than the sum of its proper divisors (140787199).

203120001 is a wasteful number, since it uses less digits than its factorization.

203120001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1074725 (or 1074719 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 203120001 is about 14252.0174361386. The cubic root of 203120001 is about 587.8288496046.

Adding to 203120001 its reverse (100021302), we get a palindrome (303141303).

The spelling of 203120001 in words is "two hundred three million, one hundred twenty thousand, one".