1015625221 has 16 divisors (see below), whose sum is σ = 1153028800. Its totient is φ = 886837248.

The previous prime is 1015625207. The next prime is 1015625239. The reversal of 1015625221 is 1225265101.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1015625221 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 (1015625201) 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 15 ways as a sum of consecutive naturals, for example, 187270 + ... + 192616.

It is an arithmetic number, because the mean of its divisors is an integer number (72064300).

Almost surely, 2^1015625221 is an apocalyptic number.

It is an amenable number.

1015625221 is a deficient number, since it is larger than the sum of its proper divisors (137403579).

1015625221 is a wasteful number, since it uses less digits than its factorization.

1015625221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6148.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 1015625221 is about 31868.8754272880. The cubic root of 1015625221 is about 1005.1815125564.

The spelling of 1015625221 in words is "one billion, fifteen million, six hundred twenty-five thousand, two hundred twenty-one".