47135857 has 4 divisors (see below), whose sum is σ = 47191716. Its totient is φ = 47080000.

The previous prime is 47135831. The next prime is 47135861. The reversal of 47135857 is 75853174.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75853174 = 2 ⋅37926587.

It can be written as a sum of positive squares in 2 ways, for example, as 20106256 + 27029601 = 4484^2 + 5199^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47135857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47135887) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26644 + ... + 28357.

It is an arithmetic number, because the mean of its divisors is an integer number (11797929).

Almost surely, 2^47135857 is an apocalyptic number.

It is an amenable number.

47135857 is a deficient number, since it is larger than the sum of its proper divisors (55859).

47135857 is an equidigital number, since it uses as much as digits as its factorization.

47135857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55858.

The product of its digits is 117600, while the sum is 40.

The square root of 47135857 is about 6865.5558405711. Note that the first 3 decimals coincide. The cubic root of 47135857 is about 361.2299928655.

The spelling of 47135857 in words is "forty-seven million, one hundred thirty-five thousand, eight hundred fifty-seven".