47291521 has 2 divisors, whose sum is σ = 47291522. Its totient is φ = 47291520.

The previous prime is 47291507. The next prime is 47291527. The reversal of 47291521 is 12519274.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37650496 + 9641025 = 6136^2 + 3105^2 .

It is a cyclic number.

It is not a de Polignac number, because 47291521 - 2¹⁹ = 46767233 is a prime.

It is equal to p_2848162 and since 47291521 and 2848162 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (47291527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23645760 + 23645761.

It is an arithmetic number, because the mean of its divisors is an integer number (23645761).

Almost surely, 2^47291521 is an apocalyptic number.

It is an amenable number.

47291521 is a deficient number, since it is larger than the sum of its proper divisors (1).

47291521 is an equidigital number, since it uses as much as digits as its factorization.

47291521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5040, while the sum is 31.

The square root of 47291521 is about 6876.8830875623. The cubic root of 47291521 is about 361.6272044079.

The spelling of 47291521 in words is "forty-seven million, two hundred ninety-one thousand, five hundred twenty-one".