867441781 has 4 divisors (see below), whose sum is σ = 871936492. Its totient is φ = 862947072.

The previous prime is 867441761. The next prime is 867441791. The reversal of 867441781 is 187144768.

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 623301156 + 244140625 = 24966^2 + 15625^2 .

It is a cyclic number.

It is not a de Polignac number, because 867441781 - 2²¹ = 865344629 is a prime.

It is a super-3 number, since 3×867441781³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (867441761) 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, 2247066 + ... + 2247451.

It is an arithmetic number, because the mean of its divisors is an integer number (217984123).

Almost surely, 2^867441781 is an apocalyptic number.

It is an amenable number.

867441781 is a deficient number, since it is larger than the sum of its proper divisors (4494711).

867441781 is a wasteful number, since it uses less digits than its factorization.

867441781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4494710.

The product of its digits is 301056, while the sum is 46.

The square root of 867441781 is about 29452.3646079564. The cubic root of 867441781 is about 953.7036515779.

The spelling of 867441781 in words is "eight hundred sixty-seven million, four hundred forty-one thousand, seven hundred eighty-one".