203112312113 has 8 divisors (see below), whose sum is σ = 208621027368. Its totient is φ = 197604607104.

The previous prime is 203112312101. The next prime is 203112312121. The reversal of 203112312113 is 311213211302.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 17134024609 + 185978287504 = 130897^2 + 431252^2 .

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 203112312113 - 2⁴ = 203112312097 is a prime.

It is a super-2 number, since 2×203112312113² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (203112312163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 164195 + ... + 658167.

It is an arithmetic number, because the mean of its divisors is an integer number (26077628421).

Almost surely, 2^203112312113 is an apocalyptic number.

It is an amenable number.

203112312113 is a deficient number, since it is larger than the sum of its proper divisors (5508715255).

203112312113 is a wasteful number, since it uses less digits than its factorization.

203112312113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505123.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 203112312113 its reverse (311213211302), we get a palindrome (514325523415).

The spelling of 203112312113 in words is "two hundred three billion, one hundred twelve million, three hundred twelve thousand, one hundred thirteen".