213896989 has 2 divisors, whose sum is σ = 213896990. Its totient is φ = 213896988.

The previous prime is 213896983. The next prime is 213897053. The reversal of 213896989 is 989698312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 213452100 + 444889 = 14610^2 + 667^2 .

It is a cyclic number.

It is not a de Polignac number, because 213896989 - 2⁷ = 213896861 is a prime.

It is a super-2 number, since 2×213896989² = 91503843806532242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213896983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106948494 + 106948495.

It is an arithmetic number, because the mean of its divisors is an integer number (106948495).

Almost surely, 2^213896989 is an apocalyptic number.

It is an amenable number.

213896989 is a deficient number, since it is larger than the sum of its proper divisors (1).

213896989 is an equidigital number, since it uses as much as digits as its factorization.

213896989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1679616, while the sum is 55.

The square root of 213896989 is about 14625.2175710312. The cubic root of 213896989 is about 598.0464136635.

The spelling of 213896989 in words is "two hundred thirteen million, eight hundred ninety-six thousand, nine hundred eighty-nine".