47221409 has 2 divisors, whose sum is σ = 47221410. Its totient is φ = 47221408.

The previous prime is 47221397. The next prime is 47221429. The reversal of 47221409 is 90412274.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44849809 + 2371600 = 6697^2 + 1540^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47221409 is a prime.

It is a super-2 number, since 2×47221409² = 4459722935890562, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (47221429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23610704 + 23610705.

It is an arithmetic number, because the mean of its divisors is an integer number (23610705).

Almost surely, 2^47221409 is an apocalyptic number.

It is an amenable number.

47221409 is a deficient number, since it is larger than the sum of its proper divisors (1).

47221409 is an equidigital number, since it uses as much as digits as its factorization.

47221409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 47221409 is about 6871.7835385000. The cubic root of 47221409 is about 361.4484059956.

The spelling of 47221409 in words is "forty-seven million, two hundred twenty-one thousand, four hundred nine".