1125721311 has 16 divisors (see below), whose sum is σ = 1763368320. Its totient is φ = 629773920.

The previous prime is 1125721307. The next prime is 1125721313. The reversal of 1125721311 is 1131275211.

It is not a de Polignac number, because 1125721311 - 2² = 1125721307 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1125721313) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1311601 + ... + 1312458.

It is an arithmetic number, because the mean of its divisors is an integer number (110210520).

Almost surely, 2^1125721311 is an apocalyptic number.

1125721311 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1125721311 is a deficient number, since it is larger than the sum of its proper divisors (637647009).

1125721311 is a wasteful number, since it uses less digits than its factorization.

1125721311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2624086.

The product of its digits is 420, while the sum is 24.

The square root of 1125721311 is about 33551.7706090156. The cubic root of 1125721311 is about 1040.2641436432.

Adding to 1125721311 its reverse (1131275211), we get a palindrome (2256996522).

The spelling of 1125721311 in words is "one billion, one hundred twenty-five million, seven hundred twenty-one thousand, three hundred eleven".