123142740889 has 9 divisors (see below), whose sum is σ = 143250535701. Its totient is φ = 105548815260.

The previous prime is 123142740881. The next prime is 123142740971. The reversal of 123142740889 is 988047241321.

The square root of 123142740889 is 350917.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 123142740889 - 2³ = 123142740881 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (123142740881) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2431354 + ... + 2481484.

It is an arithmetic number, because the mean of its divisors is an integer number (15916726189).

Almost surely, 2^123142740889 is an apocalyptic number.

123142740889 is the 350917-th square number.

123142740889 is the 175459-th centered octagonal number.

It is an amenable number.

123142740889 is a deficient number, since it is larger than the sum of its proper divisors (20107794812).

123142740889 is an frugal number, since it uses more digits than its factorization.

123142740889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100276 (or 50138 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 49.

Multiplying 123142740889 by its sum of digits (49), we get a square (6033994303561 = 2456419²).

123142740889 divided by its sum of digits (49) gives a square (2513117161 = 50131²).

The spelling of 123142740889 in words is "one hundred twenty-three billion, one hundred forty-two million, seven hundred forty thousand, eight hundred eighty-nine".