215742145 has 8 divisors (see below), whose sum is σ = 259197120. Its totient is φ = 172389360.

The previous prime is 215742119. The next prime is 215742157. The reversal of 215742145 is 541247512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 215742145 - 2¹¹ = 215740097 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20821 + ... + 29410.

It is an arithmetic number, because the mean of its divisors is an integer number (32399640).

Almost surely, 2^215742145 is an apocalyptic number.

It is an amenable number.

215742145 is a deficient number, since it is larger than the sum of its proper divisors (43454975).

215742145 is an equidigital number, since it uses as much as digits as its factorization.

215742145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51095.

The product of its digits is 11200, while the sum is 31.

The square root of 215742145 is about 14688.1634318250. The cubic root of 215742145 is about 599.7611503010.

Adding to 215742145 its reverse (541247512), we get a palindrome (756989657).

The spelling of 215742145 in words is "two hundred fifteen million, seven hundred forty-two thousand, one hundred forty-five".