13120251 has 4 divisors (see below), whose sum is σ = 17493672. Its totient is φ = 8746832.

The previous prime is 13120231. The next prime is 13120253. The reversal of 13120251 is 15202131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13120251 - 2⁶ = 13120187 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13120251.

It is not an unprimeable number, because it can be changed into a prime (13120253) 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, 2186706 + ... + 2186711.

It is an arithmetic number, because the mean of its divisors is an integer number (4373418).

Almost surely, 2^13120251 is an apocalyptic number.

13120251 is a deficient number, since it is larger than the sum of its proper divisors (4373421).

13120251 is an equidigital number, since it uses as much as digits as its factorization.

13120251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4373420.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 13120251 is about 3622.1887029806. The cubic root of 13120251 is about 235.8562456426.

Adding to 13120251 its reverse (15202131), we get a palindrome (28322382).

The spelling of 13120251 in words is "thirteen million, one hundred twenty thousand, two hundred fifty-one".