47139647 has 2 divisors, whose sum is σ = 47139648. Its totient is φ = 47139646.

The previous prime is 47139613. The next prime is 47139661. The reversal of 47139647 is 74693174.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47139647 is a prime.

It is a Chen prime.

It is equal to p_2839559 and since 47139647 and 2839559 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47139607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23569823 + 23569824.

It is an arithmetic number, because the mean of its divisors is an integer number (23569824).

Almost surely, 2^47139647 is an apocalyptic number.

47139647 is a deficient number, since it is larger than the sum of its proper divisors (1).

47139647 is an equidigital number, since it uses as much as digits as its factorization.

47139647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 127008, while the sum is 41.

The square root of 47139647 is about 6865.8318505480. The cubic root of 47139647 is about 361.2396742777.

The spelling of 47139647 in words is "forty-seven million, one hundred thirty-nine thousand, six hundred forty-seven".