47644391 has 2 divisors, whose sum is σ = 47644392. Its totient is φ = 47644390.

The previous prime is 47644369. The next prime is 47644397. The reversal of 47644391 is 19344674.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 47644391 - 2⁶ = 47644327 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47644397) 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, 23822195 + 23822196.

It is an arithmetic number, because the mean of its divisors is an integer number (23822196).

Almost surely, 2^47644391 is an apocalyptic number.

47644391 is a deficient number, since it is larger than the sum of its proper divisors (1).

47644391 is an equidigital number, since it uses as much as digits as its factorization.

47644391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 38.

The square root of 47644391 is about 6902.4916515705. The cubic root of 47644391 is about 362.5244146854.

The spelling of 47644391 in words is "forty-seven million, six hundred forty-four thousand, three hundred ninety-one".