125166913 has 4 divisors (see below), whose sum is σ = 125387460. Its totient is φ = 124946368.

The previous prime is 125166911. The next prime is 125166919. The reversal of 125166913 is 319661521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 319661521 = 23 ⋅13898327.

It can be written as a sum of positive squares in 2 ways, for example, as 87011584 + 38155329 = 9328^2 + 6177^2 .

It is a cyclic number.

It is not a de Polignac number, because 125166913 - 2¹ = 125166911 is a prime.

It is a super-2 number, since 2×125166913² = 31333512219899138, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125166911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109420 + ... + 110557.

It is an arithmetic number, because the mean of its divisors is an integer number (31346865).

Almost surely, 2^125166913 is an apocalyptic number.

It is an amenable number.

125166913 is a deficient number, since it is larger than the sum of its proper divisors (220547).

125166913 is an equidigital number, since it uses as much as digits as its factorization.

125166913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220546.

The product of its digits is 9720, while the sum is 34.

The square root of 125166913 is about 11187.8019735782. The cubic root of 125166913 is about 500.2224516825. Note that the first 3 decimals are identical.

The spelling of 125166913 in words is "one hundred twenty-five million, one hundred sixty-six thousand, nine hundred thirteen".