213463891 has 4 divisors (see below), whose sum is σ = 213517552. Its totient is φ = 213410232.

The previous prime is 213463889. The next prime is 213463903. The reversal of 213463891 is 198364312.

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

It is a cyclic number.

It is not a de Polignac number, because 213463891 - 2¹ = 213463889 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 213463891.

It is not an unprimeable number, because it can be changed into a prime (213463871) 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, 20340 + ... + 28993.

It is an arithmetic number, because the mean of its divisors is an integer number (53379388).

Almost surely, 2^213463891 is an apocalyptic number.

213463891 is a deficient number, since it is larger than the sum of its proper divisors (53661).

213463891 is an equidigital number, since it uses as much as digits as its factorization.

213463891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53660.

The product of its digits is 31104, while the sum is 37.

The square root of 213463891 is about 14610.4035194104. The cubic root of 213463891 is about 597.6425000479.

The spelling of 213463891 in words is "two hundred thirteen million, four hundred sixty-three thousand, eight hundred ninety-one".