1331222431 has 16 divisors (see below), whose sum is σ = 1660504320. Its totient is φ = 1036817280.

The previous prime is 1331222401. The next prime is 1331222437. The reversal of 1331222431 is 1342221331.

It is a cyclic number.

It is not a de Polignac number, because 1331222431 - 2⁹ = 1331221919 is a prime.

It is a super-2 number, since 2×1331222431² = 3544306321595099522, 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 (1331222437) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 316615 + ... + 320791.

It is an arithmetic number, because the mean of its divisors is an integer number (103781520).

Almost surely, 2^1331222431 is an apocalyptic number.

1331222431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1331222431 is a deficient number, since it is larger than the sum of its proper divisors (329281889).

1331222431 is a wasteful number, since it uses less digits than its factorization.

1331222431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8334.

The product of its digits is 864, while the sum is 22.

The square root of 1331222431 is about 36485.9209970092. The cubic root of 1331222431 is about 1100.0612723445.

Adding to 1331222431 its reverse (1342221331), we get a palindrome (2673443762).

The spelling of 1331222431 in words is "one billion, three hundred thirty-one million, two hundred twenty-two thousand, four hundred thirty-one".