9623981781 has 12 divisors (see below), whose sum is σ = 14001318240. Its totient is φ = 6369828840.

The previous prime is 9623981753. The next prime is 9623981797. The reversal of 9623981781 is 1871893269.

9623981781 is a `hidden beast` number, since 9 + 623 + 9 + 8 + 1 + 7 + 8 + 1 = 666.

It is not a de Polignac number, because 9623981781 - 2¹⁴ = 9623965397 is a prime.

It is a super-2 number, since 2×9623981781² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9623941781) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3845265 + ... + 3847766.

It is an arithmetic number, because the mean of its divisors is an integer number (1166776520).

Almost surely, 2^9623981781 is an apocalyptic number.

It is an amenable number.

9623981781 is a deficient number, since it is larger than the sum of its proper divisors (4377336459).

9623981781 is a wasteful number, since it uses less digits than its factorization.

9623981781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7693176 (or 7693173 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 54.

The square root of 9623981781 is about 98101.8948899561. The cubic root of 9623981781 is about 2127.0854198631.

The spelling of 9623981781 in words is "nine billion, six hundred twenty-three million, nine hundred eighty-one thousand, seven hundred eighty-one".