212309947 has 2 divisors, whose sum is σ = 212309948. Its totient is φ = 212309946.

The previous prime is 212309927. The next prime is 212310017. The reversal of 212309947 is 749903212.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212309947 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (212309927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106154973 + 106154974.

It is an arithmetic number, because the mean of its divisors is an integer number (106154974).

Almost surely, 2^212309947 is an apocalyptic number.

212309947 is a deficient number, since it is larger than the sum of its proper divisors (1).

212309947 is an equidigital number, since it uses as much as digits as its factorization.

212309947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 212309947 is about 14570.8595147987. The cubic root of 212309947 is about 596.5636408920.

The spelling of 212309947 in words is "two hundred twelve million, three hundred nine thousand, nine hundred forty-seven".