1331541557 has 2 divisors, whose sum is σ = 1331541558. Its totient is φ = 1331541556.

The previous prime is 1331541529. The next prime is 1331541571. The reversal of 1331541557 is 7551451331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 827943076 + 503598481 = 28774^2 + 22441^2 .

It is a cyclic number.

It is not a de Polignac number, because 1331541557 - 2²² = 1327347253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1331541517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665770778 + 665770779.

It is an arithmetic number, because the mean of its divisors is an integer number (665770779).

Almost surely, 2^1331541557 is an apocalyptic number.

It is an amenable number.

1331541557 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331541557 is an equidigital number, since it uses as much as digits as its factorization.

1331541557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31500, while the sum is 35.

The square root of 1331541557 is about 36490.2940108736. The cubic root of 1331541557 is about 1100.1491690267.

Adding to 1331541557 its reverse (7551451331), we get a palindrome (8882992888).

It can be divided in two parts, 13315 and 41557, that added together give a cube (54872 = 38³).

The spelling of 1331541557 in words is "one billion, three hundred thirty-one million, five hundred forty-one thousand, five hundred fifty-seven".