1953125009 has 6 divisors (see below), whose sum is σ = 2146823490. Its totient is φ = 1775568080.

The previous prime is 1953124993. The next prime is 1953125011. The reversal of 1953125009 is 9005213591.

It can be written as a sum of positive squares in only one way, i.e., 1523184784 + 429940225 = 39028^2 + 20735^2 .

It is not a de Polignac number, because 1953125009 - 2⁴ = 1953124993 is a prime.

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 1953125009.

It is not an unprimeable number, because it can be changed into a prime (1953125099) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8070644 + ... + 8070885.

It is an arithmetic number, because the mean of its divisors is an integer number (357803915).

Almost surely, 2^1953125009 is an apocalyptic number.

It is an amenable number.

1953125009 is a deficient number, since it is larger than the sum of its proper divisors (193698481).

1953125009 is a wasteful number, since it uses less digits than its factorization.

1953125009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16141551 (or 16141540 counting only the distinct ones).

The product of its (nonzero) digits is 12150, while the sum is 35.

The square root of 1953125009 is about 44194.1739259826. The cubic root of 1953125009 is about 1250.0000019200. Note that the first 5 decimals are identical.

The spelling of 1953125009 in words is "one billion, nine hundred fifty-three million, one hundred twenty-five thousand, nine".