47491991 has 8 divisors (see below), whose sum is σ = 48652800. Its totient is φ = 46343160.

The previous prime is 47491973. The next prime is 47491993. The reversal of 47491991 is 19919474.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47491991 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 (47491993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5306 + ... + 11096.

It is an arithmetic number, because the mean of its divisors is an integer number (6081600).

Almost surely, 2^47491991 is an apocalyptic number.

47491991 is a deficient number, since it is larger than the sum of its proper divisors (1160809).

47491991 is a wasteful number, since it uses less digits than its factorization.

47491991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5989.

The product of its digits is 81648, while the sum is 44.

The square root of 47491991 is about 6891.4433176222. The cubic root of 47491991 is about 362.1374664876.

The spelling of 47491991 in words is "forty-seven million, four hundred ninety-one thousand, nine hundred ninety-one".