1315321550 has 36 divisors (see below), whose sum is σ = 2582073576. Its totient is φ = 498430800.

The previous prime is 1315321529. The next prime is 1315321561. The reversal of 1315321550 is 551235131.

It is a happy number.

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 17 ways as a sum of consecutive naturals, for example, 18386 + ... + 54485.

It is an arithmetic number, because the mean of its divisors is an integer number (71724266).

Almost surely, 2^1315321550 is an apocalyptic number.

1315321550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1315321550 is a deficient number, since it is larger than the sum of its proper divisors (1266752026).

1315321550 is a wasteful number, since it uses less digits than its factorization.

1315321550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72921 (or 72897 counting only the distinct ones).

The product of its (nonzero) digits is 2250, while the sum is 26.

The square root of 1315321550 is about 36267.3620490931. The cubic root of 1315321550 is about 1095.6637969044.

Adding to 1315321550 its reverse (551235131), we get a palindrome (1866556681).

The spelling of 1315321550 in words is "one billion, three hundred fifteen million, three hundred twenty-one thousand, five hundred fifty".