47811391 has 8 divisors (see below), whose sum is σ = 50411120. Its totient is φ = 45220032.

The previous prime is 47811383. The next prime is 47811419. The reversal of 47811391 is 19311874.

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

It is a cyclic number.

It is not a de Polignac number, because 47811391 - 2³ = 47811383 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 (47811301) 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, 12211 + ... + 15643.

It is an arithmetic number, because the mean of its divisors is an integer number (6301390).

Almost surely, 2^47811391 is an apocalyptic number.

47811391 is a deficient number, since it is larger than the sum of its proper divisors (2599729).

47811391 is a wasteful number, since it uses less digits than its factorization.

47811391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4185.

The product of its digits is 6048, while the sum is 34.

The square root of 47811391 is about 6914.5781505454. The cubic root of 47811391 is about 362.9474863765.

The spelling of 47811391 in words is "forty-seven million, eight hundred eleven thousand, three hundred ninety-one".