47889931 has 2 divisors, whose sum is σ = 47889932. Its totient is φ = 47889930.

The previous prime is 47889929. The next prime is 47889949. The reversal of 47889931 is 13998874.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 47889931 - 2¹ = 47889929 is a prime.

It is a super-2 number, since 2×47889931² = 4586890982369522, which contains 22 as substring.

Together with 47889929, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (47689931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23944965 + 23944966.

It is an arithmetic number, because the mean of its divisors is an integer number (23944966).

Almost surely, 2^47889931 is an apocalyptic number.

47889931 is a deficient number, since it is larger than the sum of its proper divisors (1).

47889931 is an equidigital number, since it uses as much as digits as its factorization.

47889931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 435456, while the sum is 49.

The square root of 47889931 is about 6920.2551253548. The cubic root of 47889931 is about 363.1461161750.

It can be divided in two parts, 478 and 89931, that added together give a palindrome (90409).

The spelling of 47889931 in words is "forty-seven million, eight hundred eighty-nine thousand, nine hundred thirty-one".