47491121 has 2 divisors, whose sum is σ = 47491122. Its totient is φ = 47491120.

The previous prime is 47491117. The next prime is 47491153. The reversal of 47491121 is 12119474.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34058896 + 13432225 = 5836^2 + 3665^2 .

It is a cyclic number.

It is not a de Polignac number, because 47491121 - 2² = 47491117 is a prime.

It is not a weakly prime, because it can be changed into another prime (47491111) 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, 23745560 + 23745561.

It is an arithmetic number, because the mean of its divisors is an integer number (23745561).

Almost surely, 2^47491121 is an apocalyptic number.

It is an amenable number.

47491121 is a deficient number, since it is larger than the sum of its proper divisors (1).

47491121 is an equidigital number, since it uses as much as digits as its factorization.

47491121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 29.

The square root of 47491121 is about 6891.3801955777. The cubic root of 47491121 is about 362.1352551568.

The spelling of 47491121 in words is "forty-seven million, four hundred ninety-one thousand, one hundred twenty-one".