213520091 has 2 divisors, whose sum is σ = 213520092. Its totient is φ = 213520090.

The previous prime is 213520079. The next prime is 213520121. The reversal of 213520091 is 190025312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 213520091 - 2¹⁴ = 213503707 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (213520001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106760045 + 106760046.

It is an arithmetic number, because the mean of its divisors is an integer number (106760046).

Almost surely, 2^213520091 is an apocalyptic number.

213520091 is a deficient number, since it is larger than the sum of its proper divisors (1).

213520091 is an equidigital number, since it uses as much as digits as its factorization.

213520091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 213520091 is about 14612.3266798960. The cubic root of 213520091 is about 597.6949438299.

The spelling of 213520091 in words is "two hundred thirteen million, five hundred twenty thousand, ninety-one".