1431284221 has 4 divisors (see below), whose sum is σ = 1431453244. Its totient is φ = 1431115200.

The previous prime is 1431284203. The next prime is 1431284233. The reversal of 1431284221 is 1224821341.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1224821341 = 4159 ⋅294499.

It can be written as a sum of positive squares in 2 ways, for example, as 1277276121 + 154008100 = 35739^2 + 12410^2 .

It is a cyclic number.

It is not a de Polignac number, because 1431284221 - 2²¹ = 1429187069 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1431284221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1431584221) 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, 71100 + ... + 88981.

It is an arithmetic number, because the mean of its divisors is an integer number (357863311).

Almost surely, 2^1431284221 is an apocalyptic number.

It is an amenable number.

1431284221 is a deficient number, since it is larger than the sum of its proper divisors (169023).

1431284221 is an equidigital number, since it uses as much as digits as its factorization.

1431284221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169022.

The product of its digits is 3072, while the sum is 28.

The square root of 1431284221 is about 37832.3171508170. The cubic root of 1431284221 is about 1126.9603275674.

The spelling of 1431284221 in words is "one billion, four hundred thirty-one million, two hundred eighty-four thousand, two hundred twenty-one".