126521550 has 36 divisors (see below), whose sum is σ = 339922440. Its totient is φ = 33738960.

The previous prime is 126521543. The next prime is 126521557. The reversal of 126521550 is 55125621.

126521550 is a `hidden beast` number, since 1 + 2 + 652 + 1 + 5 + 5 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (126521543) and next prime (126521557).

It is a super-2 number, since 2×126521550² = 32015405228805000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126521557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 140130 + ... + 141029.

It is an arithmetic number, because the mean of its divisors is an integer number (9442290).

Almost surely, 2^126521550 is an apocalyptic number.

126521550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

126521550 is an abundant number, since it is smaller than the sum of its proper divisors (213400890).

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

126521550 is a wasteful number, since it uses less digits than its factorization.

126521550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281177 (or 281169 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The square root of 126521550 is about 11248.1798527584. The cubic root of 126521550 is about 502.0205570329.

The spelling of 126521550 in words is "one hundred twenty-six million, five hundred twenty-one thousand, five hundred fifty".