47165381 has 2 divisors, whose sum is σ = 47165382. Its totient is φ = 47165380.

The previous prime is 47165359. The next prime is 47165399. The reversal of 47165381 is 18356174.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44102881 + 3062500 = 6641^2 + 1750^2 .

It is a cyclic number.

It is not a de Polignac number, because 47165381 - 2⁶ = 47165317 is a prime.

It is a super-2 number, since 2×47165381² = 4449146329750322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47165981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23582690 + 23582691.

It is an arithmetic number, because the mean of its divisors is an integer number (23582691).

Almost surely, 2^47165381 is an apocalyptic number.

It is an amenable number.

47165381 is a deficient number, since it is larger than the sum of its proper divisors (1).

47165381 is an equidigital number, since it uses as much as digits as its factorization.

47165381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 35.

The square root of 47165381 is about 6867.7056576414. The cubic root of 47165381 is about 361.3053970911.

The spelling of 47165381 in words is "forty-seven million, one hundred sixty-five thousand, three hundred eighty-one".