1131434221 has 4 divisors (see below), whose sum is σ = 1131575292. Its totient is φ = 1131293152.

The previous prime is 1131434197. The next prime is 1131434233. The reversal of 1131434221 is 1224341311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1224341311 = 31 ⋅39494881.

It can be written as a sum of positive squares in 2 ways, for example, as 856206121 + 275228100 = 29261^2 + 16590^2 .

It is a cyclic number.

It is not a de Polignac number, because 1131434221 - 2²³ = 1123045613 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1131434192 and 1131434201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131434251) 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, 57730 + ... + 74803.

It is an arithmetic number, because the mean of its divisors is an integer number (282893823).

Almost surely, 2^1131434221 is an apocalyptic number.

It is an amenable number.

1131434221 is a deficient number, since it is larger than the sum of its proper divisors (141071).

1131434221 is an equidigital number, since it uses as much as digits as its factorization.

1131434221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141070.

The product of its digits is 576, while the sum is 22.

The square root of 1131434221 is about 33636.7986140180. The cubic root of 1131434221 is about 1042.0209166487.

Adding to 1131434221 its reverse (1224341311), we get a palindrome (2355775532).

The spelling of 1131434221 in words is "one billion, one hundred thirty-one million, four hundred thirty-four thousand, two hundred twenty-one".