125981545 has 8 divisors (see below), whose sum is σ = 151806600. Its totient is φ = 100366080.

The previous prime is 125981519. The next prime is 125981549. The reversal of 125981545 is 545189521.

It can be written as a sum of positive squares in 4 ways, for example, as 18071001 + 107910544 = 4251^2 + 10388^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 125981545 - 2⁷ = 125981417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 125981498 and 125981507.

It is not an unprimeable number, because it can be changed into a prime (125981549) 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 7 ways as a sum of consecutive naturals, for example, 51070 + ... + 53479.

It is an arithmetic number, because the mean of its divisors is an integer number (18975825).

Almost surely, 2^125981545 is an apocalyptic number.

It is an amenable number.

125981545 is a deficient number, since it is larger than the sum of its proper divisors (25825055).

125981545 is a wasteful number, since it uses less digits than its factorization.

125981545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104795.

The product of its digits is 72000, while the sum is 40.

The square root of 125981545 is about 11224.1500791819. The cubic root of 125981545 is about 501.3053160015.

The spelling of 125981545 in words is "one hundred twenty-five million, nine hundred eighty-one thousand, five hundred forty-five".