215157 has 4 divisors (see below), whose sum is σ = 286880. Its totient is φ = 143436.

The previous prime is 215153. The next prime is 215161. The reversal of 215157 is 751512.

215157 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (215153) and next prime (215161).

It is not a de Polignac number, because 215157 - 2² = 215153 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215153) 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, 35857 + ... + 35862.

It is an arithmetic number, because the mean of its divisors is an integer number (71720).

2²¹⁵¹⁵⁷ is an apocalyptic number.

It is an amenable number.

215157 is a deficient number, since it is larger than the sum of its proper divisors (71723).

215157 is an equidigital number, since it uses as much as digits as its factorization.

215157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71722.

The product of its digits is 350, while the sum is 21.

The square root of 215157 is about 463.8501913334. The cubic root of 215157 is about 59.9218426792.

Adding to 215157 its reverse (751512), we get a palindrome (966669).

The spelling of 215157 in words is "two hundred fifteen thousand, one hundred fifty-seven".