125840549 has 4 divisors (see below), whose sum is σ = 125881536. Its totient is φ = 125799564.

The previous prime is 125840543. The next prime is 125840551. The reversal of 125840549 is 945048521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 945048521 = 9829 ⋅96149.

It is a cyclic number.

It is not a de Polignac number, because 125840549 - 2¹² = 125836453 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 (125840543) 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, 15479 + ... + 22164.

It is an arithmetic number, because the mean of its divisors is an integer number (31470384).

Almost surely, 2^125840549 is an apocalyptic number.

It is an amenable number.

125840549 is a deficient number, since it is larger than the sum of its proper divisors (40987).

125840549 is an equidigital number, since it uses as much as digits as its factorization.

125840549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40986.

The product of its (nonzero) digits is 57600, while the sum is 38.

The square root of 125840549 is about 11217.8673998225. The cubic root of 125840549 is about 501.1182292623.

The spelling of 125840549 in words is "one hundred twenty-five million, eight hundred forty thousand, five hundred forty-nine".