9122646781 has 4 divisors (see below), whose sum is σ = 9232558272. Its totient is φ = 9012735292.

The previous prime is 9122646779. The next prime is 9122646787. The reversal of 9122646781 is 1876462219.

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: 1876462219 = 23081 ⋅81299.

It is a cyclic number.

It is not a de Polignac number, because 9122646781 - 2¹ = 9122646779 is a prime.

It is a super-2 number, since 2×9122646781² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9122646787) 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, 54955621 + ... + 54955786.

It is an arithmetic number, because the mean of its divisors is an integer number (2308139568).

Almost surely, 2^9122646781 is an apocalyptic number.

It is an amenable number.

9122646781 is a deficient number, since it is larger than the sum of its proper divisors (109911491).

9122646781 is a wasteful number, since it uses less digits than its factorization.

9122646781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109911490.

The product of its digits is 290304, while the sum is 46.

The square root of 9122646781 is about 95512.5477672960. The cubic root of 9122646781 is about 2089.4899498626.

The spelling of 9122646781 in words is "nine billion, one hundred twenty-two million, six hundred forty-six thousand, seven hundred eighty-one".