9504881981 has 16 divisors (see below), whose sum is σ = 11200240128. Its totient is φ = 7896798000.

The previous prime is 9504881977. The next prime is 9504881989. The reversal of 9504881981 is 1891884059.

It is a happy number.

It is not a de Polignac number, because 9504881981 - 2² = 9504881977 is a prime.

It is a super-2 number, since 2×9504881981² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9504881989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81095 + ... + 159956.

It is an arithmetic number, because the mean of its divisors is an integer number (700015008).

Almost surely, 2^9504881981 is an apocalyptic number.

It is an amenable number.

9504881981 is a deficient number, since it is larger than the sum of its proper divisors (1695358147).

9504881981 is a wasteful number, since it uses less digits than its factorization.

9504881981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241232.

The product of its (nonzero) digits is 829440, while the sum is 53.

The square root of 9504881981 is about 97492.9842655357. The cubic root of 9504881981 is about 2118.2745231620.

The spelling of 9504881981 in words is "nine billion, five hundred four million, eight hundred eighty-one thousand, nine hundred eighty-one".