123111560 has 64 divisors (see below), whose sum is σ = 325442880. Its totient is φ = 41322240.

The previous prime is 123111557. The next prime is 123111563. The reversal of 123111560 is 65111321.

It is an interprime number because it is at equal distance from previous prime (123111557) and next prime (123111563).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (123111563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5042 + ... + 16481.

It is an arithmetic number, because the mean of its divisors is an integer number (5085045).

Almost surely, 2^123111560 is an apocalyptic number.

123111560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123111560 is an abundant number, since it is smaller than the sum of its proper divisors (202331320).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123111560 is a wasteful number, since it uses less digits than its factorization.

123111560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21558 (or 21554 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 123111560 is about 11095.5648797166. The cubic root of 123111560 is about 497.4692926511.

Adding to 123111560 its reverse (65111321), we get a palindrome (188222881).

The spelling of 123111560 in words is "one hundred twenty-three million, one hundred eleven thousand, five hundred sixty".