125537999 has 4 divisors (see below), whose sum is σ = 125874936. Its totient is φ = 125201064.

The previous prime is 125537981. The next prime is 125538041. The reversal of 125537999 is 999735521.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 125537999 - 2¹⁶ = 125472463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125537099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 167909 + ... + 168654.

It is an arithmetic number, because the mean of its divisors is an integer number (31468734).

Almost surely, 2^125537999 is an apocalyptic number.

125537999 is a deficient number, since it is larger than the sum of its proper divisors (336937).

125537999 is an equidigital number, since it uses as much as digits as its factorization.

125537999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336936.

The product of its digits is 765450, while the sum is 50.

The square root of 125537999 is about 11204.3741012160. The cubic root of 125537999 is about 500.7163053233.

The spelling of 125537999 in words is "one hundred twenty-five million, five hundred thirty-seven thousand, nine hundred ninety-nine".