123131560 has 64 divisors (see below), whose sum is σ = 286513920. Its totient is φ = 47589120.

The previous prime is 123131551. The next prime is 123131623. The reversal of 123131560 is 65131321.

123131560 = T₃₀₁ + T₃₀₂ + ... + T₉₁₄.

It is a happy number.

It is a super-2 number, since 2×123131560² = 30322762136067200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 400927 + ... + 401233.

It is an arithmetic number, because the mean of its divisors is an integer number (4476780).

Almost surely, 2^123131560 is an apocalyptic number.

123131560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123131560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (143256960).

123131560 is an abundant number, since it is smaller than the sum of its proper divisors (163382360).

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

123131560 is a wasteful number, since it uses less digits than its factorization.

123131560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626 (or 622 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 123131560 is about 11096.4661041252. The cubic root of 123131560 is about 497.4962298646.

Adding to 123131560 its reverse (65131321), we get a palindrome (188262881).

The spelling of 123131560 in words is "one hundred twenty-three million, one hundred thirty-one thousand, five hundred sixty".