1211135125 has 16 divisors (see below), whose sum is σ = 1560259584. Its totient is φ = 937650000.

The previous prime is 1211135099. The next prime is 1211135153. The reversal of 1211135125 is 5215311121.

It is not a de Polignac number, because 1211135125 - 2¹⁹ = 1210610837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211135096 and 1211135105.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 152401 + ... + 160150.

It is an arithmetic number, because the mean of its divisors is an integer number (97516224).

Almost surely, 2^1211135125 is an apocalyptic number.

It is an amenable number.

1211135125 is a deficient number, since it is larger than the sum of its proper divisors (349124459).

1211135125 is an equidigital number, since it uses as much as digits as its factorization.

1211135125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312597 (or 312587 counting only the distinct ones).

The product of its digits is 300, while the sum is 22.

The square root of 1211135125 is about 34801.3667116681. The cubic root of 1211135125 is about 1065.9353534853.

Adding to 1211135125 its reverse (5215311121), we get a palindrome (6426446246).

The spelling of 1211135125 in words is "one billion, two hundred eleven million, one hundred thirty-five thousand, one hundred twenty-five".