123531612437 has 32 divisors (see below), whose sum is σ = 131079029760. Its totient is φ = 116291911680.

The previous prime is 123531612419. The next prime is 123531612487. The reversal of 123531612437 is 734216135321.

It is a cyclic number.

It is not a de Polignac number, because 123531612437 - 2²⁰ = 123530563861 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 123531612437.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123531612487) 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 31 ways as a sum of consecutive naturals, for example, 39377333 + ... + 39380469.

It is an arithmetic number, because the mean of its divisors is an integer number (4096219680).

Almost surely, 2^123531612437 is an apocalyptic number.

It is an amenable number.

123531612437 is a deficient number, since it is larger than the sum of its proper divisors (7547417323).

123531612437 is a wasteful number, since it uses less digits than its factorization.

123531612437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3533.

The product of its digits is 90720, while the sum is 38.

Adding to 123531612437 its reverse (734216135321), we get a palindrome (857747747758).

The spelling of 123531612437 in words is "one hundred twenty-three billion, five hundred thirty-one million, six hundred twelve thousand, four hundred thirty-seven".