47491831 has 4 divisors (see below), whose sum is σ = 48775432. Its totient is φ = 46208232.

The previous prime is 47491819. The next prime is 47491837. The reversal of 47491831 is 13819474.

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 47491831 - 2⁵ = 47491799 is a prime.

It is a super-2 number, since 2×47491831² = 4510948023465122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 1283563 = 47491831 / (4 + 7 + 4 + 9 + 1 + 8 + 3 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47491837) 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, 641745 + ... + 641818.

It is an arithmetic number, because the mean of its divisors is an integer number (12193858).

Almost surely, 2^47491831 is an apocalyptic number.

47491831 is a deficient number, since it is larger than the sum of its proper divisors (1283601).

47491831 is a wasteful number, since it uses less digits than its factorization.

47491831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1283600.

The product of its digits is 24192, while the sum is 37.

The square root of 47491831 is about 6891.4317090137. The cubic root of 47491831 is about 362.1370598081.

The spelling of 47491831 in words is "forty-seven million, four hundred ninety-one thousand, eight hundred thirty-one".