1315261820 has 12 divisors (see below), whose sum is σ = 2762049864. Its totient is φ = 526104720.

The previous prime is 1315261811. The next prime is 1315261823. The reversal of 1315261820 is 281625131.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1315261823) 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 in 3 ways as a sum of consecutive naturals, for example, 32881526 + ... + 32881565.

It is an arithmetic number, because the mean of its divisors is an integer number (230170822).

Almost surely, 2^1315261820 is an apocalyptic number.

1315261820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1315261820 is an abundant number, since it is smaller than the sum of its proper divisors (1446788044).

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

1315261820 is a wasteful number, since it uses less digits than its factorization.

1315261820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65763100 (or 65763098 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 1315261820 is about 36266.5385720777. The cubic root of 1315261820 is about 1095.6472116091.

Adding to 1315261820 its reverse (281625131), we get a palindrome (1596886951).

The spelling of 1315261820 in words is "one billion, three hundred fifteen million, two hundred sixty-one thousand, eight hundred twenty".