213051247 has 2 divisors, whose sum is σ = 213051248. Its totient is φ = 213051246.

The previous prime is 213051227. The next prime is 213051271. The reversal of 213051247 is 742150312.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 213051247 - 2⁷ = 213051119 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213051227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106525623 + 106525624.

It is an arithmetic number, because the mean of its divisors is an integer number (106525624).

Almost surely, 2^213051247 is an apocalyptic number.

213051247 is a deficient number, since it is larger than the sum of its proper divisors (1).

213051247 is an equidigital number, since it uses as much as digits as its factorization.

213051247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 213051247 is about 14596.2751070264. The cubic root of 213051247 is about 597.2571535771.

The spelling of 213051247 in words is "two hundred thirteen million, fifty-one thousand, two hundred forty-seven".