47909881 has 2 divisors, whose sum is σ = 47909882. Its totient is φ = 47909880.

The previous prime is 47909879. The next prime is 47909899. The reversal of 47909881 is 18890974.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46457856 + 1452025 = 6816^2 + 1205^2 .

It is a cyclic number.

It is not a de Polignac number, because 47909881 - 2¹ = 47909879 is a prime.

It is a super-2 number, since 2×47909881² = 4590713394868322, which contains 22 as substring.

Together with 47909879, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (47909831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23954940 + 23954941.

It is an arithmetic number, because the mean of its divisors is an integer number (23954941).

Almost surely, 2^47909881 is an apocalyptic number.

It is an amenable number.

47909881 is a deficient number, since it is larger than the sum of its proper divisors (1).

47909881 is an equidigital number, since it uses as much as digits as its factorization.

47909881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 47909881 is about 6921.6963961156. The cubic root of 47909881 is about 363.1965356758.

The spelling of 47909881 in words is "forty-seven million, nine hundred nine thousand, eight hundred eighty-one".