213709091 has 16 divisors (see below), whose sum is σ = 238528800. Its totient is φ = 190514688.

The previous prime is 213709081. The next prime is 213709099. The reversal of 213709091 is 190907312.

It is a happy number.

It is not a de Polignac number, because 213709091 - 2²⁶ = 146600227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213709099) 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, 22040 + ... + 30218.

It is an arithmetic number, because the mean of its divisors is an integer number (14908050).

Almost surely, 2^213709091 is an apocalyptic number.

213709091 is a deficient number, since it is larger than the sum of its proper divisors (24819709).

213709091 is a wasteful number, since it uses less digits than its factorization.

213709091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8278.

The product of its (nonzero) digits is 3402, while the sum is 32.

The square root of 213709091 is about 14618.7923919864. The cubic root of 213709091 is about 597.8712442265.

The spelling of 213709091 in words is "two hundred thirteen million, seven hundred nine thousand, ninety-one".