213951605 has 16 divisors (see below), whose sum is σ = 294658560. Its totient is φ = 146090112.

The previous prime is 213951587. The next prime is 213951611. The reversal of 213951605 is 506159312.

It is not a de Polignac number, because 213951605 - 2¹⁸ = 213689461 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4424 + ... + 21153.

It is an arithmetic number, because the mean of its divisors is an integer number (18416160).

Almost surely, 2^213951605 is an apocalyptic number.

It is an amenable number.

213951605 is a deficient number, since it is larger than the sum of its proper divisors (80706955).

213951605 is a wasteful number, since it uses less digits than its factorization.

213951605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25828.

The product of its (nonzero) digits is 8100, while the sum is 32.

The square root of 213951605 is about 14627.0846377533. The cubic root of 213951605 is about 598.0973106295.

The spelling of 213951605 in words is "two hundred thirteen million, nine hundred fifty-one thousand, six hundred five".