211302431 has 2 divisors, whose sum is σ = 211302432. Its totient is φ = 211302430.

The previous prime is 211302407. The next prime is 211302433. The reversal of 211302431 is 134203112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211302431 is a prime.

It is a super-2 number, since 2×211302431² = 89297434693019522, which contains 22 as substring.

Together with 211302433, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211302433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105651215 + 105651216.

It is an arithmetic number, because the mean of its divisors is an integer number (105651216).

Almost surely, 2^211302431 is an apocalyptic number.

211302431 is a deficient number, since it is larger than the sum of its proper divisors (1).

211302431 is an equidigital number, since it uses as much as digits as its factorization.

211302431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 211302431 is about 14536.2454230795. The cubic root of 211302431 is about 595.6184807739.

Adding to 211302431 its reverse (134203112), we get a palindrome (345505543).

The spelling of 211302431 in words is "two hundred eleven million, three hundred two thousand, four hundred thirty-one".