47531891 has 4 divisors (see below), whose sum is σ = 51852984. Its totient is φ = 43210800.

The previous prime is 47531879. The next prime is 47531917. The reversal of 47531891 is 19813574.

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-47531891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47531591) 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, 2160530 + ... + 2160551.

It is an arithmetic number, because the mean of its divisors is an integer number (12963246).

Almost surely, 2^47531891 is an apocalyptic number.

47531891 is a deficient number, since it is larger than the sum of its proper divisors (4321093).

47531891 is a wasteful number, since it uses less digits than its factorization.

47531891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4321092.

The product of its digits is 30240, while the sum is 38.

The square root of 47531891 is about 6894.3376041502. The cubic root of 47531891 is about 362.2388536901.

The spelling of 47531891 in words is "forty-seven million, five hundred thirty-one thousand, eight hundred ninety-one".