213956655 has 32 divisors (see below), whose sum is σ = 382572288. Its totient is φ = 101203200.

The previous prime is 213956651. The next prime is 213956671. The reversal of 213956655 is 556659312.

It is not a de Polignac number, because 213956655 - 2² = 213956651 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213956651) 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 31 ways as a sum of consecutive naturals, for example, 9049 + ... + 22578.

It is an arithmetic number, because the mean of its divisors is an integer number (11955384).

Almost surely, 2^213956655 is an apocalyptic number.

213956655 is a deficient number, since it is larger than the sum of its proper divisors (168615633).

213956655 is a wasteful number, since it uses less digits than its factorization.

213956655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31687.

The product of its digits is 243000, while the sum is 42.

The square root of 213956655 is about 14627.2572617015. The cubic root of 213956655 is about 598.1020163162.

The spelling of 213956655 in words is "two hundred thirteen million, nine hundred fifty-six thousand, six hundred fifty-five".