123219701687 has 4 divisors (see below), whose sum is σ = 124907642880. Its totient is φ = 121531760496.

The previous prime is 123219701681. The next prime is 123219701741. The reversal of 123219701687 is 786107912321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 786107912321 = 149 ⋅5275892029.

It is a cyclic number.

It is not a de Polignac number, because 123219701687 - 2⁶ = 123219701623 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 (123219701681) 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, 843970487 + ... + 843970632.

It is an arithmetic number, because the mean of its divisors is an integer number (31226910720).

Almost surely, 2^123219701687 is an apocalyptic number.

123219701687 is a deficient number, since it is larger than the sum of its proper divisors (1687941193).

123219701687 is an equidigital number, since it uses as much as digits as its factorization.

123219701687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1687941192.

The product of its (nonzero) digits is 254016, while the sum is 47.

The spelling of 123219701687 in words is "one hundred twenty-three billion, two hundred nineteen million, seven hundred one thousand, six hundred eighty-seven".