213633963 has 16 divisors (see below), whose sum is σ = 316758400. Its totient is φ = 142304040.

The previous prime is 213633943. The next prime is 213633977. The reversal of 213633963 is 369336312.

213633963 is a `hidden beast` number, since 2 + 13 + 633 + 9 + 6 + 3 = 666.

It is not a de Polignac number, because 213633963 - 2⁶ = 213633899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213633943) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40128 + ... + 45138.

It is an arithmetic number, because the mean of its divisors is an integer number (19797400).

Almost surely, 2^213633963 is an apocalyptic number.

213633963 is a deficient number, since it is larger than the sum of its proper divisors (103124437).

213633963 is a wasteful number, since it uses less digits than its factorization.

213633963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6599 (or 6593 counting only the distinct ones).

The product of its digits is 52488, while the sum is 36.

The square root of 213633963 is about 14616.2225968271. Note that the first 3 decimals coincide. The cubic root of 213633963 is about 597.8011768044.

The spelling of 213633963 in words is "two hundred thirteen million, six hundred thirty-three thousand, nine hundred sixty-three".