8148781 has 4 divisors (see below), whose sum is σ = 8229564. Its totient is φ = 8068000.

The previous prime is 8148779. The next prime is 8148793. The reversal of 8148781 is 1878418.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8037225 + 111556 = 2835^2 + 334^2 .

It is a cyclic number.

It is not a de Polignac number, because 8148781 - 2¹ = 8148779 is a prime.

It is a super-2 number, since 2×8148781² = 132805263571922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8148781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8148181) 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, 40240 + ... + 40441.

It is an arithmetic number, because the mean of its divisors is an integer number (2057391).

Almost surely, 2^8148781 is an apocalyptic number.

It is an amenable number.

8148781 is a deficient number, since it is larger than the sum of its proper divisors (80783).

8148781 is a wasteful number, since it uses less digits than its factorization.

8148781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80782.

The product of its digits is 14336, while the sum is 37.

The square root of 8148781 is about 2854.6069782021. The cubic root of 8148781 is about 201.2322340708.

The spelling of 8148781 in words is "eight million, one hundred forty-eight thousand, seven hundred eighty-one".