1331522431 has 2 divisors, whose sum is σ = 1331522432. Its totient is φ = 1331522430.

The previous prime is 1331522407. The next prime is 1331522459. The reversal of 1331522431 is 1342251331.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1331522431 - 2²⁵ = 1297967999 is a prime.

It is a super-2 number, since 2×1331522431² = 3545903968512299522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1331522396 and 1331522405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1331522131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665761215 + 665761216.

It is an arithmetic number, because the mean of its divisors is an integer number (665761216).

Almost surely, 2^1331522431 is an apocalyptic number.

1331522431 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331522431 is an equidigital number, since it uses as much as digits as its factorization.

1331522431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 25.

The square root of 1331522431 is about 36490.0319402436. The cubic root of 1331522431 is about 1100.1439015597.

Adding to 1331522431 its reverse (1342251331), we get a palindrome (2673773762).

The spelling of 1331522431 in words is "one billion, three hundred thirty-one million, five hundred twenty-two thousand, four hundred thirty-one".