1625020909 has 8 divisors (see below), whose sum is σ = 1696597632. Its totient is φ = 1553521200.

The previous prime is 1625020883. The next prime is 1625020919. The reversal of 1625020909 is 9090205261.

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

It is not a de Polignac number, because 1625020909 - 2⁷ = 1625020781 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 (1625020919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26184 + ... + 62734.

It is an arithmetic number, because the mean of its divisors is an integer number (212074704).

Almost surely, 2^1625020909 is an apocalyptic number.

It is an amenable number.

1625020909 is a deficient number, since it is larger than the sum of its proper divisors (71576723).

1625020909 is a wasteful number, since it uses less digits than its factorization.

1625020909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38507.

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

The square root of 1625020909 is about 40311.5480848851. The cubic root of 1625020909 is about 1175.6723863061.

The spelling of 1625020909 in words is "one billion, six hundred twenty-five million, twenty thousand, nine hundred nine".