9464897781 has 24 divisors (see below), whose sum is σ = 14748865560. Its totient is φ = 5826702336.

The previous prime is 9464897719. The next prime is 9464897791. The reversal of 9464897781 is 1877984649.

9464897781 is a `hidden beast` number, since 9 + 4 + 6 + 489 + 77 + 81 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 2546817156 + 6918080625 = 50466^2 + 83175^2 .

It is not a de Polignac number, because 9464897781 - 2¹⁰ = 9464896757 is a prime.

It is a super-2 number, since 2×9464897781² (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 (9464897791) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 575496 + ... + 591713.

It is an arithmetic number, because the mean of its divisors is an integer number (614536065).

Almost surely, 2^9464897781 is an apocalyptic number.

It is an amenable number.

9464897781 is a deficient number, since it is larger than the sum of its proper divisors (5283967779).

9464897781 is a wasteful number, since it uses less digits than its factorization.

9464897781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1167285 (or 1167282 counting only the distinct ones).

The product of its digits is 24385536, while the sum is 63.

The square root of 9464897781 is about 97287.7062171783. The cubic root of 9464897781 is about 2115.3000322139.

The spelling of 9464897781 in words is "nine billion, four hundred sixty-four million, eight hundred ninety-seven thousand, seven hundred eighty-one".