9671781281 has 4 divisors (see below), whose sum is σ = 9678466752. Its totient is φ = 9665095812.

The previous prime is 9671781277. The next prime is 9671781319. The reversal of 9671781281 is 1821871769.

9671781281 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1821871769 = 127 ⋅14345447.

It is a cyclic number.

It is not a de Polignac number, because 9671781281 - 2² = 9671781277 is a prime.

It is a super-2 number, since 2×9671781281² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9671781781) 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, 3340565 + ... + 3343458.

It is an arithmetic number, because the mean of its divisors is an integer number (2419616688).

Almost surely, 2^9671781281 is an apocalyptic number.

It is an amenable number.

9671781281 is a deficient number, since it is larger than the sum of its proper divisors (6685471).

9671781281 is a wasteful number, since it uses less digits than its factorization.

9671781281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6685470.

The product of its digits is 338688, while the sum is 50.

The square root of 9671781281 is about 98345.2148352933. The cubic root of 9671781281 is about 2130.6011426020.

The spelling of 9671781281 in words is "nine billion, six hundred seventy-one million, seven hundred eighty-one thousand, two hundred eighty-one".