213481989 has 24 divisors (see below), whose sum is σ = 353246400. Its totient is φ = 121701888.

The previous prime is 213481987. The next prime is 213481997. The reversal of 213481989 is 989184312.

213481989 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 213481989 - 2¹ = 213481987 is a prime.

It is a super-2 number, since 2×213481989² = 91149119254792242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213481981) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24514 + ... + 32060.

It is an arithmetic number, because the mean of its divisors is an integer number (14718600).

Almost surely, 2^213481989 is an apocalyptic number.

It is an amenable number.

213481989 is a deficient number, since it is larger than the sum of its proper divisors (139764411).

213481989 is a wasteful number, since it uses less digits than its factorization.

213481989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8009 (or 8006 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 213481989 is about 14611.0228594715. The cubic root of 213481989 is about 597.6593894435.

The spelling of 213481989 in words is "two hundred thirteen million, four hundred eighty-one thousand, nine hundred eighty-nine".