215242151 has 4 divisors (see below), whose sum is σ = 227903472. Its totient is φ = 202580832.

The previous prime is 215242129. The next prime is 215242171. The reversal of 215242151 is 151242512.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215242151 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 (215242121) 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, 6330635 + ... + 6330668.

It is an arithmetic number, because the mean of its divisors is an integer number (56975868).

Almost surely, 2^215242151 is an apocalyptic number.

215242151 is a deficient number, since it is larger than the sum of its proper divisors (12661321).

215242151 is a wasteful number, since it uses less digits than its factorization.

215242151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12661320.

The product of its digits is 800, while the sum is 23.

The square root of 215242151 is about 14671.1332554783. The cubic root of 215242151 is about 599.2974656933.

Adding to 215242151 its reverse (151242512), we get a palindrome (366484663).

The spelling of 215242151 in words is "two hundred fifteen million, two hundred forty-two thousand, one hundred fifty-one".