1331151641 has 2 divisors, whose sum is σ = 1331151642. Its totient is φ = 1331151640.

The previous prime is 1331151637. The next prime is 1331151667. The reversal of 1331151641 is 1461511331.

It is a happy number.

It is an a-pointer prime, because the next prime (1331151667) can be obtained adding 1331151641 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1265865241 + 65286400 = 35579^2 + 8080^2 .

It is a cyclic number.

It is not a de Polignac number, because 1331151641 - 2² = 1331151637 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1331151641.

It is not a weakly prime, because it can be changed into another prime (1331151631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665575820 + 665575821.

It is an arithmetic number, because the mean of its divisors is an integer number (665575821).

Almost surely, 2^1331151641 is an apocalyptic number.

It is an amenable number.

1331151641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331151641 is an equidigital number, since it uses as much as digits as its factorization.

1331151641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1080, while the sum is 26.

The square root of 1331151641 is about 36484.9508838918. The cubic root of 1331151641 is about 1100.0417727938.

Adding to 1331151641 its reverse (1461511331), we get a palindrome (2792662972).

The spelling of 1331151641 in words is "one billion, three hundred thirty-one million, one hundred fifty-one thousand, six hundred forty-one".