1143220431 has 8 divisors (see below), whose sum is σ = 1524671104. Its totient is φ = 761958360.

The previous prime is 1143220423. The next prime is 1143220447. The reversal of 1143220431 is 1340223411.

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

It is not a de Polignac number, because 1143220431 - 2³ = 1143220423 is a prime.

It is a super-2 number, since 2×1143220431² = 2613905907711651522, 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 = 1143220398 and 1143220407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1143220831) 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, 32341 + ... + 57726.

It is an arithmetic number, because the mean of its divisors is an integer number (190583888).

Almost surely, 2^1143220431 is an apocalyptic number.

1143220431 is a deficient number, since it is larger than the sum of its proper divisors (381450673).

1143220431 is an equidigital number, since it uses as much as digits as its factorization.

1143220431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94301.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 1143220431 is about 33811.5428663053. The cubic root of 1143220431 is about 1045.6266872778.

Adding to 1143220431 its reverse (1340223411), we get a palindrome (2483443842).

The spelling of 1143220431 in words is "one billion, one hundred forty-three million, two hundred twenty thousand, four hundred thirty-one".