123720013951 has 4 divisors (see below), whose sum is σ = 125816963400. Its totient is φ = 121623064504.

The previous prime is 123720013877. The next prime is 123720013973. The reversal of 123720013951 is 159310027321.

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-123720013951 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 (123720013051) 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, 1048474636 + ... + 1048474753.

It is an arithmetic number, because the mean of its divisors is an integer number (31454240850).

Almost surely, 2^123720013951 is an apocalyptic number.

123720013951 is a deficient number, since it is larger than the sum of its proper divisors (2096949449).

123720013951 is an equidigital number, since it uses as much as digits as its factorization.

123720013951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2096949448.

The product of its (nonzero) digits is 11340, while the sum is 34.

The spelling of 123720013951 in words is "one hundred twenty-three billion, seven hundred twenty million, thirteen thousand, nine hundred fifty-one".