215630361 has 12 divisors (see below), whose sum is σ = 311852580. Its totient is φ = 143575200.

The previous prime is 215630351. The next prime is 215630377. The reversal of 215630361 is 163036512.

215630361 is a `hidden beast` number, since 21 + 5 + 630 + 3 + 6 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 188787600 + 26842761 = 13740^2 + 5181^2 .

It is not a de Polignac number, because 215630361 - 2¹¹ = 215628313 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (215630351) 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, 6990 + ... + 21911.

It is an arithmetic number, because the mean of its divisors is an integer number (25987715).

Almost surely, 2^215630361 is an apocalyptic number.

It is an amenable number.

215630361 is a deficient number, since it is larger than the sum of its proper divisors (96222219).

215630361 is a wasteful number, since it uses less digits than its factorization.

215630361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29736 (or 29733 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 215630361 is about 14684.3576979043. The cubic root of 215630361 is about 599.6575462462.

Adding to 215630361 its reverse (163036512), we get a palindrome (378666873).

The spelling of 215630361 in words is "two hundred fifteen million, six hundred thirty thousand, three hundred sixty-one".