47773991 has 4 divisors (see below), whose sum is σ = 49421400. Its totient is φ = 46126584.

The previous prime is 47773981. The next prime is 47774003. The reversal of 47773991 is 19937774.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47773991 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 (47773951) 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, 823661 + ... + 823718.

It is an arithmetic number, because the mean of its divisors is an integer number (12355350).

Almost surely, 2^47773991 is an apocalyptic number.

47773991 is a deficient number, since it is larger than the sum of its proper divisors (1647409).

47773991 is a wasteful number, since it uses less digits than its factorization.

47773991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1647408.

The product of its digits is 333396, while the sum is 47.

The square root of 47773991 is about 6911.8731903877. The cubic root of 47773991 is about 362.8528242978.

The spelling of 47773991 in words is "forty-seven million, seven hundred seventy-three thousand, nine hundred ninety-one".