13507481 has 4 divisors (see below), whose sum is σ = 14546532. Its totient is φ = 12468432.

The previous prime is 13507477. The next prime is 13507493. The reversal of 13507481 is 18470531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18470531 = 2749 ⋅6719.

It can be written as a sum of positive squares in 2 ways, for example, as 9030025 + 4477456 = 3005^2 + 2116^2 .

It is a cyclic number.

It is not a de Polignac number, because 13507481 - 2² = 13507477 is a prime.

It is a super-2 number, since 2×13507481² = 364904085930722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13507411) 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 3 ways as a sum of consecutive naturals, for example, 519506 + ... + 519531.

It is an arithmetic number, because the mean of its divisors is an integer number (3636633).

Almost surely, 2^13507481 is an apocalyptic number.

It is an amenable number.

13507481 is a deficient number, since it is larger than the sum of its proper divisors (1039051).

13507481 is a wasteful number, since it uses less digits than its factorization.

13507481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1039050.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 13507481 is about 3675.2525083319. The cubic root of 13507481 is about 238.1541324411.

The spelling of 13507481 in words is "thirteen million, five hundred seven thousand, four hundred eighty-one".