47813581 has 2 divisors, whose sum is σ = 47813582. Its totient is φ = 47813580.

The previous prime is 47813551. The next prime is 47813587. The reversal of 47813581 is 18531874.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39576681 + 8236900 = 6291^2 + 2870^2 .

It is a cyclic number.

It is not a de Polignac number, because 47813581 - 2⁷ = 47813453 is a prime.

It is a super-2 number, since 2×47813581² = 4572277056087122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 47813581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47813587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23906790 + 23906791.

It is an arithmetic number, because the mean of its divisors is an integer number (23906791).

Almost surely, 2^47813581 is an apocalyptic number.

It is an amenable number.

47813581 is a deficient number, since it is larger than the sum of its proper divisors (1).

47813581 is an equidigital number, since it uses as much as digits as its factorization.

47813581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26880, while the sum is 37.

The square root of 47813581 is about 6914.7365098028. The cubic root of 47813581 is about 362.9530278931.

The spelling of 47813581 in words is "forty-seven million, eight hundred thirteen thousand, five hundred eighty-one".