213031171 has 2 divisors, whose sum is σ = 213031172. Its totient is φ = 213031170.

The previous prime is 213031157. The next prime is 213031183. The reversal of 213031171 is 171130312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 213031171 - 2⁷ = 213031043 is a prime.

It is not a weakly prime, because it can be changed into another prime (213031271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106515585 + 106515586.

It is an arithmetic number, because the mean of its divisors is an integer number (106515586).

Almost surely, 2^213031171 is an apocalyptic number.

213031171 is a deficient number, since it is larger than the sum of its proper divisors (1).

213031171 is an equidigital number, since it uses as much as digits as its factorization.

213031171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 126, while the sum is 19.

The square root of 213031171 is about 14595.5873811231. The cubic root of 213031171 is about 597.2383929715.

Adding to 213031171 its reverse (171130312), we get a palindrome (384161483).

The spelling of 213031171 in words is "two hundred thirteen million, thirty-one thousand, one hundred seventy-one".