47444821 has 2 divisors, whose sum is σ = 47444822. Its totient is φ = 47444820.

The previous prime is 47444801. The next prime is 47444833. The reversal of 47444821 is 12844474.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32148900 + 15295921 = 5670^2 + 3911^2 .

It is a cyclic number.

It is not a de Polignac number, because 47444821 - 2¹³ = 47436629 is a prime.

It is a super-2 number, since 2×47444821² = 4502022079444082, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47444801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23722410 + 23722411.

It is an arithmetic number, because the mean of its divisors is an integer number (23722411).

Almost surely, 2^47444821 is an apocalyptic number.

It is an amenable number.

47444821 is a deficient number, since it is larger than the sum of its proper divisors (1).

47444821 is an equidigital number, since it uses as much as digits as its factorization.

47444821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28672, while the sum is 34.

The square root of 47444821 is about 6888.0201074039. The cubic root of 47444821 is about 362.0175327019.

The spelling of 47444821 in words is "forty-seven million, four hundred forty-four thousand, eight hundred twenty-one".