2947457881 has 2 divisors, whose sum is σ = 2947457882. Its totient is φ = 2947457880.

The previous prime is 2947457879. The next prime is 2947457911. The reversal of 2947457881 is 1887547492.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2941977600 + 5480281 = 54240^2 + 2341^2 .

It is a cyclic number.

It is not a de Polignac number, because 2947457881 - 2¹ = 2947457879 is a prime.

It is a super-2 number, since 2×2947457881² = 17375015920538020322, which contains 22 as substring.

Together with 2947457879, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2947457081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1473728940 + 1473728941.

It is an arithmetic number, because the mean of its divisors is an integer number (1473728941).

Almost surely, 2^2947457881 is an apocalyptic number.

It is an amenable number.

2947457881 is a deficient number, since it is larger than the sum of its proper divisors (1).

2947457881 is an equidigital number, since it uses as much as digits as its factorization.

2947457881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4515840, while the sum is 55.

The square root of 2947457881 is about 54290.4953099527. The cubic root of 2947457881 is about 1433.7800589822.

The spelling of 2947457881 in words is "two billion, nine hundred forty-seven million, four hundred fifty-seven thousand, eight hundred eighty-one".