47138081 has 2 divisors, whose sum is σ = 47138082. Its totient is φ = 47138080.

The previous prime is 47138057. The next prime is 47138083. The reversal of 47138081 is 18083174.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46512400 + 625681 = 6820^2 + 791^2 .

It is a cyclic number.

It is not a de Polignac number, because 47138081 - 2²² = 42943777 is a prime.

It is a super-2 number, since 2×47138081² = 4443997360725122, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 47138083, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (47138083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23569040 + 23569041.

It is an arithmetic number, because the mean of its divisors is an integer number (23569041).

Almost surely, 2^47138081 is an apocalyptic number.

It is an amenable number.

47138081 is a deficient number, since it is larger than the sum of its proper divisors (1).

47138081 is an equidigital number, since it uses as much as digits as its factorization.

47138081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 47138081 is about 6865.7178066099. The cubic root of 47138081 is about 361.2356740526.

The spelling of 47138081 in words is "forty-seven million, one hundred thirty-eight thousand, eighty-one".