123171279731 has 8 divisors (see below), whose sum is σ = 125284988400. Its totient is φ = 121058439840.

The previous prime is 123171279683. The next prime is 123171279733. The reversal of 123171279731 is 137972171321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 123171279731 - 2³⁰ = 122097537907 is a prime.

It is a super-2 number, since 2×123171279731² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123171279733) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72065 + ... + 501533.

It is an arithmetic number, because the mean of its divisors is an integer number (15660623550).

Almost surely, 2^123171279731 is an apocalyptic number.

123171279731 is a deficient number, since it is larger than the sum of its proper divisors (2113708669).

123171279731 is an equidigital number, since it uses as much as digits as its factorization.

123171279731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434389.

The product of its digits is 111132, while the sum is 44.

The spelling of 123171279731 in words is "one hundred twenty-three billion, one hundred seventy-one million, two hundred seventy-nine thousand, seven hundred thirty-one".