1021008625 has 32 divisors (see below), whose sum is σ = 1568286720. Its totient is φ = 646257600.

The previous prime is 1021008607. The next prime is 1021008631. The reversal of 1021008625 is 5268001201.

It is not a de Polignac number, because 1021008625 - 2²⁷ = 886790897 is a prime.

It is a super-2 number, since 2×1021008625² = 2084917224648781250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a self number, because there is not a number n which added to its sum of digits gives 1021008625.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 33505 + ... + 56254.

It is an arithmetic number, because the mean of its divisors is an integer number (49008960).

Almost surely, 2^1021008625 is an apocalyptic number.

It is an amenable number.

1021008625 is a deficient number, since it is larger than the sum of its proper divisors (547278095).

1021008625 is an equidigital number, since it uses as much as digits as its factorization.

1021008625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89794 (or 89784 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 1021008625 is about 31953.2255805263. The cubic root of 1021008625 is about 1006.9543992181.

Adding to 1021008625 its reverse (5268001201), we get a palindrome (6289009826).

The spelling of 1021008625 in words is "one billion, twenty-one million, eight thousand, six hundred twenty-five".