215215455 has 32 divisors (see below), whose sum is σ = 423811584. Its totient is φ = 90815616.

The previous prime is 215215433. The next prime is 215215477. The reversal of 215215455 is 554512512.

It is an interprime number because it is at equal distance from previous prime (215215433) and next prime (215215477).

It is not a de Polignac number, because 215215455 - 2¹¹ = 215213407 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 77469 + ... + 80198.

It is an arithmetic number, because the mean of its divisors is an integer number (13244112).

Almost surely, 2^215215455 is an apocalyptic number.

215215455 is a deficient number, since it is larger than the sum of its proper divisors (208596129).

215215455 is a wasteful number, since it uses less digits than its factorization.

215215455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157695.

The product of its digits is 10000, while the sum is 30.

The square root of 215215455 is about 14670.2234134317. The cubic root of 215215455 is about 599.2726881632.

Adding to 215215455 its reverse (554512512), we get a palindrome (769727967).

The spelling of 215215455 in words is "two hundred fifteen million, two hundred fifteen thousand, four hundred fifty-five".