1331445523 has 2 divisors, whose sum is σ = 1331445524. Its totient is φ = 1331445522.

The previous prime is 1331445517. The next prime is 1331445547. The reversal of 1331445523 is 3255441331.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1331445523 is a prime.

It is not a weakly prime, because it can be changed into another prime (1331445503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665722761 + 665722762.

It is an arithmetic number, because the mean of its divisors is an integer number (665722762).

Almost surely, 2^1331445523 is an apocalyptic number.

1331445523 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331445523 is an equidigital number, since it uses as much as digits as its factorization.

1331445523 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21600, while the sum is 31.

The square root of 1331445523 is about 36488.9781029834. The cubic root of 1331445523 is about 1100.1227199172.

Adding to 1331445523 its reverse (3255441331), we get a palindrome (4586886854).

The spelling of 1331445523 in words is "one billion, three hundred thirty-one million, four hundred forty-five thousand, five hundred twenty-three".