215551441 has 12 divisors (see below), whose sum is σ = 251552628. Its totient is φ = 184162272.

The previous prime is 215551417. The next prime is 215551459. The reversal of 215551441 is 144155512.

215551441 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 14025025 + 201526416 = 3745^2 + 14196^2 .

It is not a de Polignac number, because 215551441 - 2¹¹ = 215549393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215551241) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8595 + ... + 22471.

It is an arithmetic number, because the mean of its divisors is an integer number (20962719).

Almost surely, 2^215551441 is an apocalyptic number.

It is an amenable number.

215551441 is a deficient number, since it is larger than the sum of its proper divisors (36001187).

215551441 is a wasteful number, since it uses less digits than its factorization.

215551441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14208 (or 14201 counting only the distinct ones).

The product of its digits is 4000, while the sum is 28.

The square root of 215551441 is about 14681.6702387705. The cubic root of 215551441 is about 599.5843797588.

The spelling of 215551441 in words is "two hundred fifteen million, five hundred fifty-one thousand, four hundred forty-one".