47138257 has 2 divisors, whose sum is σ = 47138258. Its totient is φ = 47138256.

The previous prime is 47138251. The next prime is 47138269. The reversal of 47138257 is 75283174.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40564161 + 6574096 = 6369^2 + 2564^2 .

It is a cyclic number.

It is not a de Polignac number, because 47138257 - 2⁷ = 47138129 is a prime.

It is not a weakly prime, because it can be changed into another prime (47138251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23569128 + 23569129.

It is an arithmetic number, because the mean of its divisors is an integer number (23569129).

Almost surely, 2^47138257 is an apocalyptic number.

It is an amenable number.

47138257 is a deficient number, since it is larger than the sum of its proper divisors (1).

47138257 is an equidigital number, since it uses as much as digits as its factorization.

47138257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47040, while the sum is 37.

The square root of 47138257 is about 6865.7306239030. The cubic root of 47138257 is about 361.2361236354.

The spelling of 47138257 in words is "forty-seven million, one hundred thirty-eight thousand, two hundred fifty-seven".