126681555 has 144 divisors (see below), whose sum is σ = 280385280. Its totient is φ = 47773440.

The previous prime is 126681521. The next prime is 126681563. The reversal of 126681555 is 555186621.

It is not a de Polignac number, because 126681555 - 2⁶ = 126681491 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

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 143 ways as a sum of consecutive naturals, for example, 2147116 + ... + 2147174.

It is an arithmetic number, because the mean of its divisors is an integer number (1947120).

Almost surely, 2^126681555 is an apocalyptic number.

126681555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

126681555 is an abundant number, since it is smaller than the sum of its proper divisors (153703725).

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

126681555 is a wasteful number, since it uses less digits than its factorization.

126681555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122 (or 98 counting only the distinct ones).

The product of its digits is 72000, while the sum is 39.

The square root of 126681555 is about 11255.2900895534. The cubic root of 126681555 is about 502.2320940181.

The spelling of 126681555 in words is "one hundred twenty-six million, six hundred eighty-one thousand, five hundred fifty-five".