125442749 has 4 divisors (see below), whose sum is σ = 125577564. Its totient is φ = 125307936.

The previous prime is 125442743. The next prime is 125442761. The reversal of 125442749 is 947244521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 947244521 = 2927 ⋅323623.

It can be written as a sum of positive squares in 2 ways, for example, as 36517849 + 88924900 = 6043^2 + 9430^2 .

It is a cyclic number.

It is not a de Polignac number, because 125442749 - 2²⁰ = 124394173 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 (125442743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66002 + ... + 67875.

It is an arithmetic number, because the mean of its divisors is an integer number (31394391).

Almost surely, 2^125442749 is an apocalyptic number.

It is an amenable number.

125442749 is a deficient number, since it is larger than the sum of its proper divisors (134815).

125442749 is an equidigital number, since it uses as much as digits as its factorization.

125442749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134814.

The product of its digits is 80640, while the sum is 38.

The square root of 125442749 is about 11200.1227225419. The cubic root of 125442749 is about 500.5896363845.

The spelling of 125442749 in words is "one hundred twenty-five million, four hundred forty-two thousand, seven hundred forty-nine".