1209915125 has 32 divisors (see below), whose sum is σ = 1580027904. Its totient is φ = 924048000.

The previous prime is 1209915103. The next prime is 1209915127. The reversal of 1209915125 is 5215199021.

It is not a de Polignac number, because 1209915125 - 2¹⁸ = 1209652981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1209915127) 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, 238364 + ... + 243386.

It is an arithmetic number, because the mean of its divisors is an integer number (49375872).

Almost surely, 2^1209915125 is an apocalyptic number.

It is an amenable number.

1209915125 is a deficient number, since it is larger than the sum of its proper divisors (370112779).

1209915125 is an equidigital number, since it uses as much as digits as its factorization.

1209915125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5126 (or 5116 counting only the distinct ones).

The product of its (nonzero) digits is 8100, while the sum is 35.

The square root of 1209915125 is about 34783.8342481101. The cubic root of 1209915125 is about 1065.5773207598.

The spelling of 1209915125 in words is "one billion, two hundred nine million, nine hundred fifteen thousand, one hundred twenty-five".