47911187 has 2 divisors, whose sum is σ = 47911188. Its totient is φ = 47911186.

The previous prime is 47911181. The next prime is 47911211. The reversal of 47911187 is 78111974.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47911187 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 47911187.

It is not a weakly prime, because it can be changed into another prime (47911181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23955593 + 23955594.

It is an arithmetic number, because the mean of its divisors is an integer number (23955594).

Almost surely, 2^47911187 is an apocalyptic number.

47911187 is a deficient number, since it is larger than the sum of its proper divisors (1).

47911187 is an equidigital number, since it uses as much as digits as its factorization.

47911187 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14112, while the sum is 38.

The square root of 47911187 is about 6921.7907365074. The cubic root of 47911187 is about 363.1998358327.

The spelling of 47911187 in words is "forty-seven million, nine hundred eleven thousand, one hundred eighty-seven".