1125021003 has 4 divisors (see below), whose sum is σ = 1500028008. Its totient is φ = 750014000.

The previous prime is 1125020993. The next prime is 1125021043. The reversal of 1125021003 is 3001205211.

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 1125021003 - 2²⁰ = 1123972427 is a prime.

It is a super-2 number, since 2×1125021003² = 2531344514382252018, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1125021043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 187503498 + ... + 187503503.

It is an arithmetic number, because the mean of its divisors is an integer number (375007002).

Almost surely, 2^1125021003 is an apocalyptic number.

1125021003 is a deficient number, since it is larger than the sum of its proper divisors (375007005).

1125021003 is an equidigital number, since it uses as much as digits as its factorization.

1125021003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375007004.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 1125021003 is about 33541.3327552738. The cubic root of 1125021003 is about 1040.0483837821.

Adding to 1125021003 its reverse (3001205211), we get a palindrome (4126226214).

The spelling of 1125021003 in words is "one billion, one hundred twenty-five million, twenty-one thousand, three".