125818947 has 32 divisors (see below), whose sum is σ = 195379200. Its totient is φ = 80022888.

The previous prime is 125818943. The next prime is 125818949. The reversal of 125818947 is 749818521.

It is not a de Polignac number, because 125818947 - 2² = 125818943 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (125818943) 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 31 ways as a sum of consecutive naturals, for example, 328318 + ... + 328700.

It is an arithmetic number, because the mean of its divisors is an integer number (6105600).

Almost surely, 2^125818947 is an apocalyptic number.

125818947 is a deficient number, since it is larger than the sum of its proper divisors (69560253).

125818947 is an frugal number, since it uses more digits than its factorization.

125818947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461 (or 409 counting only the distinct ones).

The product of its digits is 161280, while the sum is 45.

The square root of 125818947 is about 11216.9045195187. The cubic root of 125818947 is about 501.0895533557.

It can be divided in two parts, 12581 and 8947, that added together give a triangular number (21528 = T₂₀₇).

The spelling of 125818947 in words is "one hundred twenty-five million, eight hundred eighteen thousand, nine hundred forty-seven".