47508781 has 2 divisors, whose sum is σ = 47508782. Its totient is φ = 47508780.

The previous prime is 47508779. The next prime is 47508809. The reversal of 47508781 is 18780574.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37711881 + 9796900 = 6141^2 + 3130^2 .

It is a cyclic number.

It is not a de Polignac number, because 47508781 - 2¹ = 47508779 is a prime.

It is a super-2 number, since 2×47508781² = 4514168544211922, which contains 22 as substring.

Together with 47508779, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47508701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23754390 + 23754391.

It is an arithmetic number, because the mean of its divisors is an integer number (23754391).

Almost surely, 2^47508781 is an apocalyptic number.

It is an amenable number.

47508781 is a deficient number, since it is larger than the sum of its proper divisors (1).

47508781 is an equidigital number, since it uses as much as digits as its factorization.

47508781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62720, while the sum is 40.

The square root of 47508781 is about 6892.6613873017. The cubic root of 47508781 is about 362.1801373433.

It can be divided in two parts, 4750 and 8781, that added together give a palindrome (13531).

The spelling of 47508781 in words is "forty-seven million, five hundred eight thousand, seven hundred eighty-one".