1131021309 has 16 divisors (see below), whose sum is σ = 1645694784. Its totient is φ = 685228800.

The previous prime is 1131021289. The next prime is 1131021319. The reversal of 1131021309 is 9031201311.

It is not a de Polignac number, because 1131021309 - 2⁸ = 1131021053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131021319) 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, 155269 + ... + 162389.

It is an arithmetic number, because the mean of its divisors is an integer number (102855924).

Almost surely, 2^1131021309 is an apocalyptic number.

It is an amenable number.

1131021309 is a deficient number, since it is larger than the sum of its proper divisors (514673475).

1131021309 is a wasteful number, since it uses less digits than its factorization.

1131021309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11948.

The product of its (nonzero) digits is 162, while the sum is 21.

The square root of 1131021309 is about 33630.6602522163. The cubic root of 1131021309 is about 1041.8941408909.

It can be divided in two parts, 113102 and 1309, that added together give a palindrome (114411).

The spelling of 1131021309 in words is "one billion, one hundred thirty-one million, twenty-one thousand, three hundred nine".