13215157 has 4 divisors (see below), whose sum is σ = 13311756. Its totient is φ = 13118560.

The previous prime is 13215151. The next prime is 13215187. The reversal of 13215157 is 75151231.

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

It can be written as a sum of positive squares in 2 ways, for example, as 11115556 + 2099601 = 3334^2 + 1449^2 .

It is a cyclic number.

It is not a de Polignac number, because 13215157 - 2⁷ = 13215029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13215151) 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, 48094 + ... + 48367.

It is an arithmetic number, because the mean of its divisors is an integer number (3327939).

Almost surely, 2^13215157 is an apocalyptic number.

It is an amenable number.

13215157 is a deficient number, since it is larger than the sum of its proper divisors (96599).

13215157 is an equidigital number, since it uses as much as digits as its factorization.

13215157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96598.

The product of its digits is 1050, while the sum is 25.

The square root of 13215157 is about 3635.2657399425. The cubic root of 13215157 is about 236.4235726029.

Adding to 13215157 its reverse (75151231), we get a palindrome (88366388).

The spelling of 13215157 in words is "thirteen million, two hundred fifteen thousand, one hundred fifty-seven".