47687917 has 2 divisors, whose sum is σ = 47687918. Its totient is φ = 47687916.

The previous prime is 47687851. The next prime is 47687953. The reversal of 47687917 is 71978674.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46635241 + 1052676 = 6829^2 + 1026^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47687917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47687957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23843958 + 23843959.

It is an arithmetic number, because the mean of its divisors is an integer number (23843959).

Almost surely, 2^47687917 is an apocalyptic number.

It is an amenable number.

47687917 is a deficient number, since it is larger than the sum of its proper divisors (1).

47687917 is an equidigital number, since it uses as much as digits as its factorization.

47687917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 592704, while the sum is 49.

The square root of 47687917 is about 6905.6438512278. The cubic root of 47687917 is about 362.6347769945.

The spelling of 47687917 in words is "forty-seven million, six hundred eighty-seven thousand, nine hundred seventeen".