213623969 has 4 divisors (see below), whose sum is σ = 230056596. Its totient is φ = 197191344.

The previous prime is 213623881. The next prime is 213624001. The reversal of 213623969 is 969326312.

213623969 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 101263969 + 112360000 = 10063^2 + 10600^2 .

It is a cyclic number.

It is not a de Polignac number, because 213623969 - 2⁸ = 213623713 is a prime.

It is a super-2 number, since 2×213623969² = 91270400262625922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213623369) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8216294 + ... + 8216319.

It is an arithmetic number, because the mean of its divisors is an integer number (57514149).

Almost surely, 2^213623969 is an apocalyptic number.

It is an amenable number.

213623969 is a deficient number, since it is larger than the sum of its proper divisors (16432627).

213623969 is a wasteful number, since it uses less digits than its factorization.

213623969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16432626.

The product of its digits is 104976, while the sum is 41.

The square root of 213623969 is about 14615.8807124306. The cubic root of 213623969 is about 597.7918547564.

The spelling of 213623969 in words is "two hundred thirteen million, six hundred twenty-three thousand, nine hundred sixty-nine".