1002125515 has 4 divisors (see below), whose sum is σ = 1202550624. Its totient is φ = 801700408.

The previous prime is 1002125489. The next prime is 1002125519. The reversal of 1002125515 is 5155212001.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1002125515 - 2¹⁵ = 1002092747 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1002125519) 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 3 ways as a sum of consecutive naturals, for example, 100212547 + ... + 100212556.

It is an arithmetic number, because the mean of its divisors is an integer number (300637656).

Almost surely, 2^1002125515 is an apocalyptic number.

1002125515 is a deficient number, since it is larger than the sum of its proper divisors (200425109).

1002125515 is an equidigital number, since it uses as much as digits as its factorization.

1002125515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200425108.

The product of its (nonzero) digits is 500, while the sum is 22.

The square root of 1002125515 is about 31656.3661054139. The cubic root of 1002125515 is about 1000.7080036126.

Adding to 1002125515 its reverse (5155212001), we get a palindrome (6157337516).

The spelling of 1002125515 in words is "one billion, two million, one hundred twenty-five thousand, five hundred fifteen".