47889781 has 2 divisors, whose sum is σ = 47889782. Its totient is φ = 47889780.

The previous prime is 47889767. The next prime is 47889811. The reversal of 47889781 is 18798874.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40436881 + 7452900 = 6359^2 + 2730^2 .

It is a cyclic number.

It is not a de Polignac number, because 47889781 - 2²³ = 39501173 is a prime.

It is a super-2 number, since 2×47889781² = 4586862248455922, which contains 22 as substring.

It is a zygodrome in base 5.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47889181) 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, 23944890 + 23944891.

It is an arithmetic number, because the mean of its divisors is an integer number (23944891).

Almost surely, 2^47889781 is an apocalyptic number.

It is an amenable number.

47889781 is a deficient number, since it is larger than the sum of its proper divisors (1).

47889781 is an equidigital number, since it uses as much as digits as its factorization.

47889781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 903168, while the sum is 52.

The square root of 47889781 is about 6920.2442875956. The cubic root of 47889781 is about 363.1457370280.

The spelling of 47889781 in words is "forty-seven million, eight hundred eighty-nine thousand, seven hundred eighty-one".