123721089 has 4 divisors (see below), whose sum is σ = 164961456. Its totient is φ = 82480724.

The previous prime is 123721079. The next prime is 123721099. The reversal of 123721089 is 980127321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (123721079) and next prime (123721099).

It is a cyclic number.

It is not a de Polignac number, because 123721089 - 2⁸ = 123720833 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (123721049) 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, 20620179 + ... + 20620184.

It is an arithmetic number, because the mean of its divisors is an integer number (41240364).

Almost surely, 2^123721089 is an apocalyptic number.

It is an amenable number.

123721089 is a deficient number, since it is larger than the sum of its proper divisors (41240367).

123721089 is an equidigital number, since it uses as much as digits as its factorization.

123721089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41240366.

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 123721089 is about 11122.9982019238. The cubic root of 123721089 is about 498.2889365364.

The spelling of 123721089 in words is "one hundred twenty-three million, seven hundred twenty-one thousand, eighty-nine".