212951647 has 2 divisors, whose sum is σ = 212951648. Its totient is φ = 212951646.

The previous prime is 212951623. The next prime is 212951653. The reversal of 212951647 is 746159212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212951647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212951657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106475823 + 106475824.

It is an arithmetic number, because the mean of its divisors is an integer number (106475824).

Almost surely, 2^212951647 is an apocalyptic number.

212951647 is a deficient number, since it is larger than the sum of its proper divisors (1).

212951647 is an equidigital number, since it uses as much as digits as its factorization.

212951647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 37.

The square root of 212951647 is about 14592.8628788185. The cubic root of 212951647 is about 597.1640678593.

The spelling of 212951647 in words is "two hundred twelve million, nine hundred fifty-one thousand, six hundred forty-seven".