13581002 has 4 divisors (see below), whose sum is σ = 20371506. Its totient is φ = 6790500.

The previous prime is 13580989. The next prime is 13581053. The reversal of 13581002 is 20018531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20018531 = 13 ⋅1539887.

It can be written as a sum of positive squares in only one way, i.e., 13388281 + 192721 = 3659^2 + 439^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3395249 + ... + 3395252.

Almost surely, 2^13581002 is an apocalyptic number.

13581002 is a deficient number, since it is larger than the sum of its proper divisors (6790504).

13581002 is an equidigital number, since it uses as much as digits as its factorization.

13581002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6790503.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 13581002 is about 3685.2411047311. The cubic root of 13581002 is about 238.5854405441.

Adding to 13581002 its reverse (20018531), we get a palindrome (33599533).

The spelling of 13581002 in words is "thirteen million, five hundred eighty-one thousand, two".