213891871 has 2 divisors, whose sum is σ = 213891872. Its totient is φ = 213891870.

The previous prime is 213891827. The next prime is 213891889. The reversal of 213891871 is 178198312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 213891871 - 2¹³ = 213883679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213841871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106945935 + 106945936.

It is an arithmetic number, because the mean of its divisors is an integer number (106945936).

Almost surely, 2^213891871 is an apocalyptic number.

213891871 is a deficient number, since it is larger than the sum of its proper divisors (1).

213891871 is an equidigital number, since it uses as much as digits as its factorization.

213891871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 40.

The square root of 213891871 is about 14625.0425982286. The cubic root of 213891871 is about 598.0416437258.

The spelling of 213891871 in words is "two hundred thirteen million, eight hundred ninety-one thousand, eight hundred seventy-one".