123611578249 has 4 divisors (see below), whose sum is σ = 123616945360. Its totient is φ = 123606211140.

The previous prime is 123611578247. The next prime is 123611578261. The reversal of 123611578249 is 942875116321.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 123611578249 - 2¹ = 123611578247 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123611578247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2648859 + ... + 2695120.

It is an arithmetic number, because the mean of its divisors is an integer number (30904236340).

Almost surely, 2^123611578249 is an apocalyptic number.

It is an amenable number.

123611578249 is a deficient number, since it is larger than the sum of its proper divisors (5367111).

123611578249 is an equidigital number, since it uses as much as digits as its factorization.

123611578249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5367110.

The product of its digits is 725760, while the sum is 49.

The spelling of 123611578249 in words is "one hundred twenty-three billion, six hundred eleven million, five hundred seventy-eight thousand, two hundred forty-nine".