47446991 has 2 divisors, whose sum is σ = 47446992. Its totient is φ = 47446990.

The previous prime is 47446981. The next prime is 47447003. The reversal of 47446991 is 19964474.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47446991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47446901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23723495 + 23723496.

It is an arithmetic number, because the mean of its divisors is an integer number (23723496).

Almost surely, 2^47446991 is an apocalyptic number.

47446991 is a deficient number, since it is larger than the sum of its proper divisors (1).

47446991 is an equidigital number, since it uses as much as digits as its factorization.

47446991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 44.

The square root of 47446991 is about 6888.1776254681. The cubic root of 47446991 is about 362.0230518576.

The spelling of 47446991 in words is "forty-seven million, four hundred forty-six thousand, nine hundred ninety-one".