125609947 has 4 divisors (see below), whose sum is σ = 127980000. Its totient is φ = 123239896.

The previous prime is 125609941. The next prime is 125609951. The reversal of 125609947 is 749906521.

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 125609947 - 2²³ = 117221339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125609941) 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, 1184947 + ... + 1185052.

It is an arithmetic number, because the mean of its divisors is an integer number (31995000).

Almost surely, 2^125609947 is an apocalyptic number.

125609947 is a deficient number, since it is larger than the sum of its proper divisors (2370053).

125609947 is an equidigital number, since it uses as much as digits as its factorization.

125609947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2370052.

The product of its (nonzero) digits is 136080, while the sum is 43.

The square root of 125609947 is about 11207.5843516790. The cubic root of 125609947 is about 500.8119434486.

The spelling of 125609947 in words is "one hundred twenty-five million, six hundred nine thousand, nine hundred forty-seven".