47391881 has 2 divisors, whose sum is σ = 47391882. Its totient is φ = 47391880.

The previous prime is 47391853. The next prime is 47391893. The reversal of 47391881 is 18819374.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25452025 + 21939856 = 5045^2 + 4684^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47391881 is a prime.

It is a super-2 number, since 2×47391881² = 4491980769436322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (47391821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23695940 + 23695941.

It is an arithmetic number, because the mean of its divisors is an integer number (23695941).

Almost surely, 2^47391881 is an apocalyptic number.

It is an amenable number.

47391881 is a deficient number, since it is larger than the sum of its proper divisors (1).

47391881 is an equidigital number, since it uses as much as digits as its factorization.

47391881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 41.

The square root of 47391881 is about 6884.1761308090. The cubic root of 47391881 is about 361.8828334834.

The spelling of 47391881 in words is "forty-seven million, three hundred ninety-one thousand, eight hundred eighty-one".