125991937 has 4 divisors (see below), whose sum is σ = 126482436. Its totient is φ = 125501440.

The previous prime is 125991923. The next prime is 125991961. The reversal of 125991937 is 739199521.

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

It can be written as a sum of positive squares in 2 ways, for example, as 111007296 + 14984641 = 10536^2 + 3871^2 .

It is a cyclic number.

It is not a de Polignac number, because 125991937 - 2⁷ = 125991809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125991977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 244864 + ... + 245377.

It is an arithmetic number, because the mean of its divisors is an integer number (31620609).

Almost surely, 2^125991937 is an apocalyptic number.

It is an amenable number.

125991937 is a deficient number, since it is larger than the sum of its proper divisors (490499).

125991937 is an equidigital number, since it uses as much as digits as its factorization.

125991937 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490498.

The product of its digits is 153090, while the sum is 46.

The square root of 125991937 is about 11224.6130000103. The cubic root of 125991937 is about 501.3190995590.

The spelling of 125991937 in words is "one hundred twenty-five million, nine hundred ninety-one thousand, nine hundred thirty-seven".