1131421231 has 8 divisors (see below), whose sum is σ = 1138702320. Its totient is φ = 1124151168.

The previous prime is 1131421217. The next prime is 1131421259. The reversal of 1131421231 is 1321241311.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1131421231 - 2¹³ = 1131413039 is a prime.

It is a super-2 number, since 2×1131421231² = 2560228003915110722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1131421199 and 1131421208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131421931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 316305 + ... + 319861.

It is an arithmetic number, because the mean of its divisors is an integer number (142337790).

Almost surely, 2^1131421231 is an apocalyptic number.

1131421231 is a deficient number, since it is larger than the sum of its proper divisors (7281089).

1131421231 is a wasteful number, since it uses less digits than its factorization.

1131421231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5513.

The product of its digits is 144, while the sum is 19.

The square root of 1131421231 is about 33636.6055213662. The cubic root of 1131421231 is about 1042.0169288182.

Adding to 1131421231 its reverse (1321241311), we get a palindrome (2452662542).

The spelling of 1131421231 in words is "one billion, one hundred thirty-one million, four hundred twenty-one thousand, two hundred thirty-one".