123132511523501 has 4 divisors (see below), whose sum is σ = 123136825784604. Its totient is φ = 123128197262400.

The previous prime is 123132511523473. The next prime is 123132511523519. The reversal of 123132511523501 is 105325115231321.

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

It can be written as a sum of positive squares in 2 ways, for example, as 24084037187401 + 99048474336100 = 4907549^2 + 9952310^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123132511523501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123132511523551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2157087740 + ... + 2157144821.

It is an arithmetic number, because the mean of its divisors is an integer number (30784206446151).

Almost surely, 2^{123132511523501} is an apocalyptic number.

It is an amenable number.

123132511523501 is a deficient number, since it is larger than the sum of its proper divisors (4314261103).

123132511523501 is an equidigital number, since it uses as much as digits as its factorization.

123132511523501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4314261102.

The product of its (nonzero) digits is 27000, while the sum is 35.

Adding to 123132511523501 its reverse (105325115231321), we get a palindrome (228457626754822).

The spelling of 123132511523501 in words is "one hundred twenty-three trillion, one hundred thirty-two billion, five hundred eleven million, five hundred twenty-three thousand, five hundred one".