47988991 has 4 divisors (see below), whose sum is σ = 48007984. Its totient is φ = 47970000.

The previous prime is 47988979. The next prime is 47989001. The reversal of 47988991 is 19988974.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 47988991 - 2²⁵ = 14434559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47988191) 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, 4995 + ... + 10996.

It is an arithmetic number, because the mean of its divisors is an integer number (12001996).

Almost surely, 2^47988991 is an apocalyptic number.

47988991 is a deficient number, since it is larger than the sum of its proper divisors (18993).

47988991 is a wasteful number, since it uses less digits than its factorization.

47988991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18992.

The product of its digits is 1306368, while the sum is 55.

The square root of 47988991 is about 6927.4086785753. The cubic root of 47988991 is about 363.3963321634.

The spelling of 47988991 in words is "forty-seven million, nine hundred eighty-eight thousand, nine hundred ninety-one".