123721617049 has 16 divisors (see below), whose sum is σ = 126648437760. Its totient is φ = 120817719360.

The previous prime is 123721617037. The next prime is 123721617079. The reversal of 123721617049 is 940716127321.

It is a cyclic number.

It is not a de Polignac number, because 123721617049 - 2⁵ = 123721617017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123721616996 and 123721617014.

It is not an unprimeable number, because it can be changed into a prime (123721617079) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15249504 + ... + 15257614.

It is an arithmetic number, because the mean of its divisors is an integer number (7915527360).

Almost surely, 2^123721617049 is an apocalyptic number.

It is an amenable number.

123721617049 is a deficient number, since it is larger than the sum of its proper divisors (2926820711).

123721617049 is a wasteful number, since it uses less digits than its factorization.

123721617049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9480.

The product of its (nonzero) digits is 127008, while the sum is 43.

The spelling of 123721617049 in words is "one hundred twenty-three billion, seven hundred twenty-one million, six hundred seventeen thousand, forty-nine".