213630989 has 16 divisors (see below), whose sum is σ = 251475840. Its totient is φ = 178916160.

The previous prime is 213630983. The next prime is 213630997. The reversal of 213630989 is 989036312.

It is a cyclic number.

It is not a de Polignac number, because 213630989 - 2⁴ = 213630973 is a prime.

It is a super-2 number, since 2×213630989² = 91276398922236242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213630983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91367 + ... + 93675.

It is an arithmetic number, because the mean of its divisors is an integer number (15717240).

Almost surely, 2^213630989 is an apocalyptic number.

It is an amenable number.

213630989 is a deficient number, since it is larger than the sum of its proper divisors (37844851).

213630989 is a wasteful number, since it uses less digits than its factorization.

213630989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2980.

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 213630989 is about 14616.1208602009. The cubic root of 213630989 is about 597.7984027933.

The spelling of 213630989 in words is "two hundred thirteen million, six hundred thirty thousand, nine hundred eighty-nine".