47213209 has 2 divisors, whose sum is σ = 47213210. Its totient is φ = 47213208.

The previous prime is 47213171. The next prime is 47213237. The reversal of 47213209 is 90231274.

It is an a-pointer prime, because the next prime (47213237) can be obtained adding 47213209 to its sum of digits (28).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35462025 + 11751184 = 5955^2 + 3428^2 .

It is a cyclic number.

It is not a de Polignac number, because 47213209 - 2¹⁷ = 47082137 is a prime.

It is not a weakly prime, because it can be changed into another prime (47213249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23606604 + 23606605.

It is an arithmetic number, because the mean of its divisors is an integer number (23606605).

Almost surely, 2^47213209 is an apocalyptic number.

It is an amenable number.

47213209 is a deficient number, since it is larger than the sum of its proper divisors (1).

47213209 is an equidigital number, since it uses as much as digits as its factorization.

47213209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 47213209 is about 6871.1868698210. The cubic root of 47213209 is about 361.4274829400.

The spelling of 47213209 in words is "forty-seven million, two hundred thirteen thousand, two hundred nine".