13520735987 has 16 divisors (see below), whose sum is σ = 15621286752. Its totient is φ = 11565765120.

The previous prime is 13520735981. The next prime is 13520735993. The reversal of 13520735987 is 78953702531.

It is an interprime number because it is at equal distance from previous prime (13520735981) and next prime (13520735993).

It is a cyclic number.

It is not a de Polignac number, because 13520735987 - 2¹⁴ = 13520719603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13520735981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1288253 + ... + 1298705.

It is an arithmetic number, because the mean of its divisors is an integer number (976330422).

Almost surely, 2^13520735987 is an apocalyptic number.

13520735987 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

13520735987 is a deficient number, since it is larger than the sum of its proper divisors (2100550765).

13520735987 is a wasteful number, since it uses less digits than its factorization.

13520735987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17398.

The product of its (nonzero) digits is 1587600, while the sum is 50.

The spelling of 13520735987 in words is "thirteen billion, five hundred twenty million, seven hundred thirty-five thousand, nine hundred eighty-seven".