1315521841 has 2 divisors, whose sum is σ = 1315521842. Its totient is φ = 1315521840.

The previous prime is 1315521827. The next prime is 1315521847. The reversal of 1315521841 is 1481255131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 768897441 + 546624400 = 27729^2 + 23380^2 .

It is a cyclic number.

It is not a de Polignac number, because 1315521841 - 2¹⁹ = 1314997553 is a prime.

It is not a weakly prime, because it can be changed into another prime (1315521847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 657760920 + 657760921.

It is an arithmetic number, because the mean of its divisors is an integer number (657760921).

Almost surely, 2^1315521841 is an apocalyptic number.

It is an amenable number.

1315521841 is a deficient number, since it is larger than the sum of its proper divisors (1).

1315521841 is an equidigital number, since it uses as much as digits as its factorization.

1315521841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4800, while the sum is 31.

The square root of 1315521841 is about 36270.1232559251. The cubic root of 1315521841 is about 1095.7194082641.

Adding to 1315521841 its reverse (1481255131), we get a palindrome (2796776972).

The spelling of 1315521841 in words is "one billion, three hundred fifteen million, five hundred twenty-one thousand, eight hundred forty-one".