213491109 has 24 divisors (see below), whose sum is σ = 309267072. Its totient is φ = 130940160.

The previous prime is 213491081. The next prime is 213491111. The reversal of 213491109 is 901194312.

It is not a de Polignac number, because 213491109 - 2⁵ = 213491077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213491119) 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, 218029 + ... + 219005.

It is an arithmetic number, because the mean of its divisors is an integer number (12886128).

Almost surely, 2^213491109 is an apocalyptic number.

It is an amenable number.

213491109 is a deficient number, since it is larger than the sum of its proper divisors (95775963).

213491109 is a wasteful number, since it uses less digits than its factorization.

213491109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1437 (or 1424 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 213491109 is about 14611.3349492782. The cubic root of 213491109 is about 597.6679000381.

The spelling of 213491109 in words is "two hundred thirteen million, four hundred ninety-one thousand, one hundred nine".