309012125 has 8 divisors (see below), whose sum is σ = 385647288. Its totient is φ = 247209600.

The previous prime is 309012103. The next prime is 309012163. The reversal of 309012125 is 521210903.

It can be written as a sum of positive squares in 4 ways, for example, as 763876 + 308248249 = 874^2 + 17557^2 .

It is not a de Polignac number, because 309012125 - 2⁸ = 309011869 is a prime.

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

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 309012125.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1235924 + ... + 1236173.

It is an arithmetic number, because the mean of its divisors is an integer number (48205911).

Almost surely, 2^309012125 is an apocalyptic number.

It is an amenable number.

309012125 is a deficient number, since it is larger than the sum of its proper divisors (76635163).

309012125 is an equidigital number, since it uses as much as digits as its factorization.

309012125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2472112 (or 2472102 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 309012125 is about 17578.7407114389. The cubic root of 309012125 is about 676.0702728260.

The spelling of 309012125 in words is "three hundred nine million, twelve thousand, one hundred twenty-five".