13500247 has 4 divisors (see below), whose sum is σ = 13575016. Its totient is φ = 13425480.

The previous prime is 13500211. The next prime is 13500259. The reversal of 13500247 is 74200531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74200531 = 29 ⋅2558639.

It is a cyclic number.

It is not a de Polignac number, because 13500247 - 2⁷ = 13500119 is a prime.

It is a super-2 number, since 2×13500247² = 364513338122018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13500647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37113 + ... + 37474.

It is an arithmetic number, because the mean of its divisors is an integer number (3393754).

Almost surely, 2^13500247 is an apocalyptic number.

13500247 is a deficient number, since it is larger than the sum of its proper divisors (74769).

13500247 is an equidigital number, since it uses as much as digits as its factorization.

13500247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74768.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 13500247 is about 3674.2682264636. The cubic root of 13500247 is about 238.1116099644. Note that the first 3 decimals are identical.

Adding to 13500247 its reverse (74200531), we get a palindrome (87700778).

The spelling of 13500247 in words is "thirteen million, five hundred thousand, two hundred forty-seven".