215255641 has 4 divisors (see below), whose sum is σ = 218784484. Its totient is φ = 211726800.

The previous prime is 215255627. The next prime is 215255647. The reversal of 215255641 is 146552512.

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 96118416 + 119137225 = 9804^2 + 10915^2 .

It is a cyclic number.

It is not a de Polignac number, because 215255641 - 2⁵ = 215255609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215255647) 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, 1764330 + ... + 1764451.

It is an arithmetic number, because the mean of its divisors is an integer number (54696121).

Almost surely, 2^215255641 is an apocalyptic number.

It is an amenable number.

215255641 is a deficient number, since it is larger than the sum of its proper divisors (3528843).

215255641 is an equidigital number, since it uses as much as digits as its factorization.

215255641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3528842.

The product of its digits is 12000, while the sum is 31.

The square root of 215255641 is about 14671.5929946274. The cubic root of 215255641 is about 599.3099854745.

The spelling of 215255641 in words is "two hundred fifteen million, two hundred fifty-five thousand, six hundred forty-one".