125505810 has 24 divisors (see below), whose sum is σ = 326315340. Its totient is φ = 33468192.

The previous prime is 125505769. The next prime is 125505817. The reversal of 125505810 is 18505521.

It can be written as a sum of positive squares in 2 ways, for example, as 125417601 + 88209 = 11199^2 + 297^2 .

It is a super-2 number, since 2×125505810² = 31503416687512200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (125505817) 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 11 ways as a sum of consecutive naturals, for example, 697165 + ... + 697344.

Almost surely, 2^125505810 is an apocalyptic number.

125505810 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

125505810 is an abundant number, since it is smaller than the sum of its proper divisors (200809530).

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

125505810 is a wasteful number, since it uses less digits than its factorization.

125505810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1394522 (or 1394519 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 27.

The square root of 125505810 is about 11202.9375611935. The cubic root of 125505810 is about 500.6735057061.

The spelling of 125505810 in words is "one hundred twenty-five million, five hundred five thousand, eight hundred ten".