125145109 has 8 divisors (see below), whose sum is σ = 136781568. Its totient is φ = 113983680.

The previous prime is 125145091. The next prime is 125145113. The reversal of 125145109 is 901541521.

125145109 = 1902² + 1903² + ... + 1935².

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125145109 is a prime.

It is a super-2 number, since 2×125145109² = 31322596613243762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125145149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118207 + ... + 119260.

It is an arithmetic number, because the mean of its divisors is an integer number (17097696).

Almost surely, 2^125145109 is an apocalyptic number.

It is an amenable number.

125145109 is a deficient number, since it is larger than the sum of its proper divisors (11636459).

125145109 is a wasteful number, since it uses less digits than its factorization.

125145109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237515.

The product of its (nonzero) digits is 1800, while the sum is 28.

The square root of 125145109 is about 11186.8274769928. The cubic root of 125145109 is about 500.1934038469.

It can be divided in two parts, 1251 and 45109, that added together give a triangular number (46360 = T₃₀₄).

The spelling of 125145109 in words is "one hundred twenty-five million, one hundred forty-five thousand, one hundred nine".