1315768621 has 8 divisors (see below), whose sum is σ = 1344885120. Its totient is φ = 1286963808.

The previous prime is 1315768609. The next prime is 1315768633. The reversal of 1315768621 is 1268675131.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1315768609) and next prime (1315768633).

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 1315768621 - 2¹³ = 1315760429 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 (1315768651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69376 + ... + 86281.

It is an arithmetic number, because the mean of its divisors is an integer number (168110640).

Almost surely, 2^1315768621 is an apocalyptic number.

It is an amenable number.

1315768621 is a deficient number, since it is larger than the sum of its proper divisors (29116499).

1315768621 is a wasteful number, since it uses less digits than its factorization.

1315768621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155843.

The product of its digits is 60480, while the sum is 40.

The square root of 1315768621 is about 36273.5250699460. The cubic root of 1315768621 is about 1095.7879196641.

The spelling of 1315768621 in words is "one billion, three hundred fifteen million, seven hundred sixty-eight thousand, six hundred twenty-one".