213968401 has 4 divisors (see below), whose sum is σ = 214270900. Its totient is φ = 213665904.

The previous prime is 213968383. The next prime is 213968407. The reversal of 213968401 is 104869312.

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 46240000 + 167728401 = 6800^2 + 12951^2 .

It is a cyclic number.

It is not a de Polignac number, because 213968401 - 2²¹ = 211871249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213968407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 150186 + ... + 151603.

It is an arithmetic number, because the mean of its divisors is an integer number (53567725).

Almost surely, 2^213968401 is an apocalyptic number.

It is an amenable number.

213968401 is a deficient number, since it is larger than the sum of its proper divisors (302499).

213968401 is an equidigital number, since it uses as much as digits as its factorization.

213968401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302498.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 213968401 is about 14627.6587668704. The cubic root of 213968401 is about 598.1129611775.

It can be divided in two parts, 213968 and 401, that added together give a square (214369 = 463²).

The spelling of 213968401 in words is "two hundred thirteen million, nine hundred sixty-eight thousand, four hundred one".