201251532431 has 4 divisors (see below), whose sum is σ = 201962668872. Its totient is φ = 200540395992.

The previous prime is 201251532413. The next prime is 201251532437. The reversal of 201251532431 is 134235152102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201251532431 is a prime.

It is a super-2 number, since 2×201251532431² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201251532394 and 201251532403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201251532437) 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 3 ways as a sum of consecutive naturals, for example, 355567796 + ... + 355568361.

It is an arithmetic number, because the mean of its divisors is an integer number (50490667218).

Almost surely, 2^201251532431 is an apocalyptic number.

201251532431 is a deficient number, since it is larger than the sum of its proper divisors (711136441).

201251532431 is an equidigital number, since it uses as much as digits as its factorization.

201251532431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 711136440.

The product of its (nonzero) digits is 7200, while the sum is 29.

Adding to 201251532431 its reverse (134235152102), we get a palindrome (335486684533).

The spelling of 201251532431 in words is "two hundred one billion, two hundred fifty-one million, five hundred thirty-two thousand, four hundred thirty-one".