47891511 has 12 divisors (see below), whose sum is σ = 69443088. Its totient is φ = 31804704.

The previous prime is 47891509. The next prime is 47891513. The reversal of 47891511 is 11519874.

It is an interprime number because it is at equal distance from previous prime (47891509) and next prime (47891513).

It is not a de Polignac number, because 47891511 - 2¹ = 47891509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47891513) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7750 + ... + 12483.

It is an arithmetic number, because the mean of its divisors is an integer number (5786924).

Almost surely, 2^47891511 is an apocalyptic number.

47891511 is a deficient number, since it is larger than the sum of its proper divisors (21551577).

47891511 is a wasteful number, since it uses less digits than its factorization.

47891511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20502 (or 20499 counting only the distinct ones).

The product of its digits is 10080, while the sum is 36.

The square root of 47891511 is about 6920.3692820542. The cubic root of 47891511 is about 363.1501098089.

The spelling of 47891511 in words is "forty-seven million, eight hundred ninety-one thousand, five hundred eleven".