125249971 has 32 divisors (see below), whose sum is σ = 162736128. Its totient is φ = 93575040.

The previous prime is 125249959. The next prime is 125250061. The reversal of 125249971 is 179942521.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 125249971 - 2⁹ = 125249459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125249911) 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, 191481 + ... + 192133.

It is an arithmetic number, because the mean of its divisors is an integer number (5085504).

Almost surely, 2^125249971 is an apocalyptic number.

125249971 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

125249971 is a deficient number, since it is larger than the sum of its proper divisors (37486157).

125249971 is a wasteful number, since it uses less digits than its factorization.

125249971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 771.

The product of its digits is 45360, while the sum is 40.

The square root of 125249971 is about 11191.5133471752. The cubic root of 125249971 is about 500.3330727425. Note that the first 3 decimals are identical.

The spelling of 125249971 in words is "one hundred twenty-five million, two hundred forty-nine thousand, nine hundred seventy-one".