213977089 has 4 divisors (see below), whose sum is σ = 216908356. Its totient is φ = 211045824.

The previous prime is 213977077. The next prime is 213977131. The reversal of 213977089 is 980779312.

It is a happy number.

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 106502400 + 107474689 = 10320^2 + 10367^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213977089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213977189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1465524 + ... + 1465669.

It is an arithmetic number, because the mean of its divisors is an integer number (54227089).

Almost surely, 2^213977089 is an apocalyptic number.

It is an amenable number.

213977089 is a deficient number, since it is larger than the sum of its proper divisors (2931267).

213977089 is an equidigital number, since it uses as much as digits as its factorization.

213977089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2931266.

The product of its (nonzero) digits is 190512, while the sum is 46.

The square root of 213977089 is about 14627.9557355086. The cubic root of 213977089 is about 598.1210563527.

The spelling of 213977089 in words is "two hundred thirteen million, nine hundred seventy-seven thousand, eighty-nine".