1331325447 has 4 divisors (see below), whose sum is σ = 1775100600. Its totient is φ = 887550296.

The previous prime is 1331325377. The next prime is 1331325467. The reversal of 1331325447 is 7445231331.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7445231331 = 3 ⋅2481743777.

It is a cyclic number.

It is not a de Polignac number, because 1331325447 - 2⁷ = 1331325319 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331325467) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 221887572 + ... + 221887577.

It is an arithmetic number, because the mean of its divisors is an integer number (443775150).

Almost surely, 2^1331325447 is an apocalyptic number.

1331325447 is a deficient number, since it is larger than the sum of its proper divisors (443775153).

1331325447 is an equidigital number, since it uses as much as digits as its factorization.

1331325447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443775152.

The product of its digits is 30240, while the sum is 33.

The square root of 1331325447 is about 36487.3326923194. The cubic root of 1331325447 is about 1100.0896475147.

Adding to 1331325447 its reverse (7445231331), we get a palindrome (8776556778).

The spelling of 1331325447 in words is "one billion, three hundred thirty-one million, three hundred twenty-five thousand, four hundred forty-seven".