213606261 has 48 divisors (see below), whose sum is σ = 350949760. Its totient is φ = 128304000.

The previous prime is 213606259. The next prime is 213606277. The reversal of 213606261 is 162606312.

213606261 is a `hidden beast` number, since 2 + 1 + 36 + 0 + 626 + 1 = 666.

It is not a de Polignac number, because 213606261 - 2¹ = 213606259 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213606161) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 493101 + ... + 493533.

Almost surely, 2^213606261 is an apocalyptic number.

It is an amenable number.

213606261 is a deficient number, since it is larger than the sum of its proper divisors (137343499).

213606261 is a wasteful number, since it uses less digits than its factorization.

213606261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 615 (or 598 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 213606261 is about 14615.2749204385. The cubic root of 213606261 is about 597.7753366495.

The spelling of 213606261 in words is "two hundred thirteen million, six hundred six thousand, two hundred sixty-one".