47218789 has 2 divisors, whose sum is σ = 47218790. Its totient is φ = 47218788.

The previous prime is 47218753. The next prime is 47218817. The reversal of 47218789 is 98781274.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26697889 + 20520900 = 5167^2 + 4530^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47218789 is a prime.

It is a super-2 number, since 2×47218789² = 4459228069253042, which contains 22 as substring.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47218709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23609394 + 23609395.

It is an arithmetic number, because the mean of its divisors is an integer number (23609395).

Almost surely, 2^47218789 is an apocalyptic number.

It is an amenable number.

47218789 is a deficient number, since it is larger than the sum of its proper divisors (1).

47218789 is an equidigital number, since it uses as much as digits as its factorization.

47218789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 225792, while the sum is 46.

The square root of 47218789 is about 6871.5929012129. The cubic root of 47218789 is about 361.4417210875.

The spelling of 47218789 in words is "forty-seven million, two hundred eighteen thousand, seven hundred eighty-nine".