211305131 has 2 divisors, whose sum is σ = 211305132. Its totient is φ = 211305130.

The previous prime is 211305109. The next prime is 211305161. The reversal of 211305131 is 131503112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 211305131 - 2⁶ = 211305067 is a prime.

It is a super-2 number, since 2×211305131² = 89299716773854322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (211305161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105652565 + 105652566.

It is an arithmetic number, because the mean of its divisors is an integer number (105652566).

Almost surely, 2^211305131 is an apocalyptic number.

211305131 is a deficient number, since it is larger than the sum of its proper divisors (1).

211305131 is an equidigital number, since it uses as much as digits as its factorization.

211305131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90, while the sum is 17.

The square root of 211305131 is about 14536.3382940822. The cubic root of 211305131 is about 595.6210176797.

Adding to 211305131 its reverse (131503112), we get a palindrome (342808243).

The spelling of 211305131 in words is "two hundred eleven million, three hundred five thousand, one hundred thirty-one".