9953493581 has 2 divisors, whose sum is σ = 9953493582. Its totient is φ = 9953493580.

The previous prime is 9953493559. The next prime is 9953493601. The reversal of 9953493581 is 1853943599.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6784816900 + 3168676681 = 82370^2 + 56291^2 .

It is an emirp because it is prime and its reverse (1853943599) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9953493581 - 2¹⁸ = 9953231437 is a prime.

It is a super-2 number, since 2×9953493581² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9953490581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4976746790 + 4976746791.

It is an arithmetic number, because the mean of its divisors is an integer number (4976746791).

Almost surely, 2^9953493581 is an apocalyptic number.

It is an amenable number.

9953493581 is a deficient number, since it is larger than the sum of its proper divisors (1).

9953493581 is an equidigital number, since it uses as much as digits as its factorization.

9953493581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5248800, while the sum is 56.

The square root of 9953493581 is about 99767.1969186265. The cubic root of 9953493581 is about 2151.0896644081.

The spelling of 9953493581 in words is "nine billion, nine hundred fifty-three million, four hundred ninety-three thousand, five hundred eighty-one".