213931989 has 16 divisors (see below), whose sum is σ = 317442240. Its totient is φ = 142393680.

The previous prime is 213931969. The next prime is 213931997. The reversal of 213931989 is 989139312.

It is a happy number.

213931989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 213931989 - 2¹¹ = 213929941 is a prime.

It is a super-2 number, since 2×213931989² = 91533791834992242, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213931909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11854 + ... + 23840.

It is an arithmetic number, because the mean of its divisors is an integer number (19840140).

Almost surely, 2^213931989 is an apocalyptic number.

It is an amenable number.

213931989 is a deficient number, since it is larger than the sum of its proper divisors (103510251).

213931989 is a wasteful number, since it uses less digits than its factorization.

213931989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12657 (or 12651 counting only the distinct ones).

The product of its digits is 104976, while the sum is 45.

The square root of 213931989 is about 14626.4140854825. The cubic root of 213931989 is about 598.0790313627.

The spelling of 213931989 in words is "two hundred thirteen million, nine hundred thirty-one thousand, nine hundred eighty-nine".