12515550 has 24 divisors (see below), whose sum is σ = 31038936. Its totient is φ = 3337440.

The previous prime is 12515549. The next prime is 12515551. The reversal of 12515550 is 5551521.

It is an interprime number because it is at equal distance from previous prime (12515549) and next prime (12515551).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12515550.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12515551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41569 + ... + 41868.

It is an arithmetic number, because the mean of its divisors is an integer number (1293289).

Almost surely, 2^12515550 is an apocalyptic number.

12515550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12515550 is an abundant number, since it is smaller than the sum of its proper divisors (18523386).

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

12515550 is a wasteful number, since it uses less digits than its factorization.

12515550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83452 (or 83447 counting only the distinct ones).

The product of its (nonzero) digits is 1250, while the sum is 24.

The square root of 12515550 is about 3537.7323245265. The cubic root of 12515550 is about 232.1756374110.

The spelling of 12515550 in words is "twelve million, five hundred fifteen thousand, five hundred fifty".