1315121020 has 24 divisors (see below), whose sum is σ = 2924211024. Its totient is φ = 495104256.

The previous prime is 1315121009. The next prime is 1315121039. The reversal of 1315121020 is 201215131.

It is a junction number, because it is equal to n+sod(n) for n = 1315120985 and 1315121003.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 1933662 + ... + 1934341.

It is an arithmetic number, because the mean of its divisors is an integer number (121842126).

Almost surely, 2^1315121020 is an apocalyptic number.

1315121020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1315121020 is an abundant number, since it is smaller than the sum of its proper divisors (1609090004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1315121020 is a wasteful number, since it uses less digits than its factorization.

1315121020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3868029 (or 3868027 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 1315121020 is about 36264.5973367967. The cubic root of 1315121020 is about 1095.6081135298.

Adding to 1315121020 its reverse (201215131), we get a palindrome (1516336151).

The spelling of 1315121020 in words is "one billion, three hundred fifteen million, one hundred twenty-one thousand, twenty".