105471781 has 2 divisors, whose sum is σ = 105471782. Its totient is φ = 105471780.

The previous prime is 105471731. The next prime is 105471809. The reversal of 105471781 is 187174501.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85266756 + 20205025 = 9234^2 + 4495^2 .

It is an emirp because it is prime and its reverse (187174501) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 105471781 - 2¹¹ = 105469733 is a prime.

It is a super-2 number, since 2×105471781² = 22248593174623922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (105471731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52735890 + 52735891.

It is an arithmetic number, because the mean of its divisors is an integer number (52735891).

Almost surely, 2^105471781 is an apocalyptic number.

It is an amenable number.

105471781 is a deficient number, since it is larger than the sum of its proper divisors (1).

105471781 is an equidigital number, since it uses as much as digits as its factorization.

105471781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7840, while the sum is 34.

The square root of 105471781 is about 10269.9455207903. The cubic root of 105471781 is about 472.4749196769.

The spelling of 105471781 in words is "one hundred five million, four hundred seventy-one thousand, seven hundred eighty-one".