213838091 has 2 divisors, whose sum is σ = 213838092. Its totient is φ = 213838090.

The previous prime is 213838057. The next prime is 213838099. The reversal of 213838091 is 190838312.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213838091 is a prime.

It is not a weakly prime, because it can be changed into another prime (213838099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106919045 + 106919046.

It is an arithmetic number, because the mean of its divisors is an integer number (106919046).

Almost surely, 2^213838091 is an apocalyptic number.

213838091 is a deficient number, since it is larger than the sum of its proper divisors (1).

213838091 is an equidigital number, since it uses as much as digits as its factorization.

213838091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 213838091 is about 14623.2038555168. The cubic root of 213838091 is about 597.9915165666.

The spelling of 213838091 in words is "two hundred thirteen million, eight hundred thirty-eight thousand, ninety-one".