201031521503 has 2 divisors, whose sum is σ = 201031521504. Its totient is φ = 201031521502.

The previous prime is 201031521373. The next prime is 201031521517. The reversal of 201031521503 is 305125130102.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 201031521503 - 2²⁰ = 201030472927 is a prime.

It is a super-2 number, since 2×201031521503² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201031524503) 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 as a sum of consecutive naturals, namely, 100515760751 + 100515760752.

It is an arithmetic number, because the mean of its divisors is an integer number (100515760752).

Almost surely, 2^201031521503 is an apocalyptic number.

201031521503 is a deficient number, since it is larger than the sum of its proper divisors (1).

201031521503 is an equidigital number, since it uses as much as digits as its factorization.

201031521503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 900, while the sum is 23.

Adding to 201031521503 its reverse (305125130102), we get a palindrome (506156651605).

The spelling of 201031521503 in words is "two hundred one billion, thirty-one million, five hundred twenty-one thousand, five hundred three".