1315121553 has 6 divisors (see below), whose sum is σ = 1899620034. Its totient is φ = 876747696.

The previous prime is 1315121543. The next prime is 1315121557. The reversal of 1315121553 is 3551215131.

1315121553 is a `hidden beast` number, since 131 + 512 + 15 + 5 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1298377089 + 16744464 = 36033^2 + 4092^2 .

It is not a de Polignac number, because 1315121553 - 2¹⁰ = 1315120529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1315121557) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 73062300 + ... + 73062317.

It is an arithmetic number, because the mean of its divisors is an integer number (316603339).

Almost surely, 2^1315121553 is an apocalyptic number.

It is an amenable number.

1315121553 is a deficient number, since it is larger than the sum of its proper divisors (584498481).

1315121553 is a wasteful number, since it uses less digits than its factorization.

1315121553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146124623 (or 146124620 counting only the distinct ones).

The product of its digits is 2250, while the sum is 27.

The square root of 1315121553 is about 36264.6046855608. The cubic root of 1315121553 is about 1095.6082615413.

Adding to 1315121553 its reverse (3551215131), we get a palindrome (4866336684).

The spelling of 1315121553 in words is "one billion, three hundred fifteen million, one hundred twenty-one thousand, five hundred fifty-three".