123315512501 has 4 divisors (see below), whose sum is σ = 123316242432. Its totient is φ = 123314782572.

The previous prime is 123315512497. The next prime is 123315512513. The reversal of 123315512501 is 105215513321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 123315512501 - 2² = 123315512497 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 (123315542501) 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, 33356 + ... + 497738.

It is an arithmetic number, because the mean of its divisors is an integer number (30829060608).

Almost surely, 2^123315512501 is an apocalyptic number.

It is an amenable number.

123315512501 is a deficient number, since it is larger than the sum of its proper divisors (729931).

123315512501 is an equidigital number, since it uses as much as digits as its factorization.

123315512501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 729930.

The product of its (nonzero) digits is 4500, while the sum is 29.

The spelling of 123315512501 in words is "one hundred twenty-three billion, three hundred fifteen million, five hundred twelve thousand, five hundred one".