1313015621 has 8 divisors (see below), whose sum is σ = 1422584064. Its totient is φ = 1207039680.

The previous prime is 1313015617. The next prime is 1313015659. The reversal of 1313015621 is 1265103131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1313015621 - 2² = 1313015617 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1313012621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 897365 + ... + 898826.

It is an arithmetic number, because the mean of its divisors is an integer number (177823008).

Almost surely, 2^1313015621 is an apocalyptic number.

It is an amenable number.

1313015621 is a deficient number, since it is larger than the sum of its proper divisors (109568443).

1313015621 is a wasteful number, since it uses less digits than its factorization.

1313015621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1796251.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 1313015621 is about 36235.5574125747. The cubic root of 1313015621 is about 1095.0231422032.

Adding to 1313015621 its reverse (1265103131), we get a palindrome (2578118752).

The spelling of 1313015621 in words is "one billion, three hundred thirteen million, fifteen thousand, six hundred twenty-one".