213961889 has 4 divisors (see below), whose sum is σ = 214095024. Its totient is φ = 213828756.

The previous prime is 213961879. The next prime is 213961919. The reversal of 213961889 is 988169312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 213961889 - 2⁴ = 213961873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213961849) 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, 64127 + ... + 67380.

It is an arithmetic number, because the mean of its divisors is an integer number (53523756).

Almost surely, 2^213961889 is an apocalyptic number.

It is an amenable number.

213961889 is a deficient number, since it is larger than the sum of its proper divisors (133135).

213961889 is a wasteful number, since it uses less digits than its factorization.

213961889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133134.

The product of its digits is 186624, while the sum is 47.

The square root of 213961889 is about 14627.4361731645. The cubic root of 213961889 is about 598.1068933794.

The spelling of 213961889 in words is "two hundred thirteen million, nine hundred sixty-one thousand, eight hundred eighty-nine".