1215981313 has 8 divisors (see below), whose sum is σ = 1230252800. Its totient is φ = 1201789008.

The previous prime is 1215981311. The next prime is 1215981317. The reversal of 1215981313 is 3131895121.

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 1215981313 - 2¹ = 1215981311 is a prime.

It is a super-2 number, since 2×1215981313² = 2957221107130407938, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1215981311) 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, 11383 + ... + 50611.

It is an arithmetic number, because the mean of its divisors is an integer number (153781600).

Almost surely, 2^1215981313 is an apocalyptic number.

It is an amenable number.

1215981313 is a deficient number, since it is larger than the sum of its proper divisors (14271487).

1215981313 is a wasteful number, since it uses less digits than its factorization.

1215981313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39591.

The product of its digits is 6480, while the sum is 34.

The square root of 1215981313 is about 34870.9236040573. The cubic root of 1215981313 is about 1067.3551918707.

The spelling of 1215981313 in words is "one billion, two hundred fifteen million, nine hundred eighty-one thousand, three hundred thirteen".