1131025121 has 4 divisors (see below), whose sum is σ = 1131112644. Its totient is φ = 1130937600.

The previous prime is 1131025109. The next prime is 1131025123. The reversal of 1131025121 is 1215201311.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 566440000 + 564585121 = 23800^2 + 23761^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1131025121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1131025121.

It is not an unprimeable number, because it can be changed into a prime (1131025123) 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 3 ways as a sum of consecutive naturals, for example, 20120 + ... + 51641.

It is an arithmetic number, because the mean of its divisors is an integer number (282778161).

Almost surely, 2^1131025121 is an apocalyptic number.

It is an amenable number.

1131025121 is a deficient number, since it is larger than the sum of its proper divisors (87523).

1131025121 is an equidigital number, since it uses as much as digits as its factorization.

1131025121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87522.

The product of its (nonzero) digits is 60, while the sum is 17.

The square root of 1131025121 is about 33630.7169266431. The cubic root of 1131025121 is about 1041.8953114247.

Adding to 1131025121 its reverse (1215201311), we get a palindrome (2346226432).

The spelling of 1131025121 in words is "one billion, one hundred thirty-one million, twenty-five thousand, one hundred twenty-one".