1131421331 has 4 divisors (see below), whose sum is σ = 1145743200. Its totient is φ = 1117099464.

The previous prime is 1131421327. The next prime is 1131421373. The reversal of 1131421331 is 1331241311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1331241311 = 23 ⋅57880057.

It is a cyclic number.

It is not a de Polignac number, because 1131421331 - 2² = 1131421327 is a prime.

It is a super-2 number, since 2×1131421331² = 2560228456483623122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1131421301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7160816 + ... + 7160973.

It is an arithmetic number, because the mean of its divisors is an integer number (286435800).

Almost surely, 2^1131421331 is an apocalyptic number.

1131421331 is a deficient number, since it is larger than the sum of its proper divisors (14321869).

1131421331 is an equidigital number, since it uses as much as digits as its factorization.

1131421331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14321868.

The product of its digits is 216, while the sum is 20.

The square root of 1131421331 is about 33636.6070078419. The cubic root of 1131421331 is about 1042.0169595176.

Adding to 1131421331 its reverse (1331241311), we get a palindrome (2462662642).

The spelling of 1131421331 in words is "one billion, one hundred thirty-one million, four hundred twenty-one thousand, three hundred thirty-one".