1331022431 has 4 divisors (see below), whose sum is σ = 1331175912. Its totient is φ = 1330868952.

The previous prime is 1331022421. The next prime is 1331022437. The reversal of 1331022431 is 1342201331.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1331022431 - 2²² = 1326828127 is a prime.

It is a super-2 number, since 2×1331022431² = 3543241423650299522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331022437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62900 + ... + 81353.

It is an arithmetic number, because the mean of its divisors is an integer number (332793978).

Almost surely, 2^1331022431 is an apocalyptic number.

1331022431 is a deficient number, since it is larger than the sum of its proper divisors (153481).

1331022431 is an equidigital number, since it uses as much as digits as its factorization.

1331022431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153480.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 1331022431 is about 36483.1801108401. The cubic root of 1331022431 is about 1100.0061793041.

Adding to 1331022431 its reverse (1342201331), we get a palindrome (2673223762).

The spelling of 1331022431 in words is "one billion, three hundred thirty-one million, twenty-two thousand, four hundred thirty-one".