47691391 has 4 divisors (see below), whose sum is σ = 52026984. Its totient is φ = 43355800.

The previous prime is 47691389. The next prime is 47691401. The reversal of 47691391 is 19319674.

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 47691391 - 2¹ = 47691389 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 (47691191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2167780 + ... + 2167801.

It is an arithmetic number, because the mean of its divisors is an integer number (13006746).

Almost surely, 2^47691391 is an apocalyptic number.

47691391 is a deficient number, since it is larger than the sum of its proper divisors (4335593).

47691391 is a wasteful number, since it uses less digits than its factorization.

47691391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4335592.

The product of its digits is 40824, while the sum is 40.

The square root of 47691391 is about 6905.8953800358. The cubic root of 47691391 is about 362.6435825977.

The spelling of 47691391 in words is "forty-seven million, six hundred ninety-one thousand, three hundred ninety-one".