9642955381 has 2 divisors, whose sum is σ = 9642955382. Its totient is φ = 9642955380.

The previous prime is 9642955351. The next prime is 9642955447. The reversal of 9642955381 is 1835592469.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7185274756 + 2457680625 = 84766^2 + 49575^2 .

It is an emirp because it is prime and its reverse (1835592469) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9642955381 - 2⁵ = 9642955349 is a prime.

It is a super-2 number, since 2×9642955381² (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 (9642955351) 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 as a sum of consecutive naturals, namely, 4821477690 + 4821477691.

It is an arithmetic number, because the mean of its divisors is an integer number (4821477691).

Almost surely, 2^9642955381 is an apocalyptic number.

It is an amenable number.

9642955381 is a deficient number, since it is larger than the sum of its proper divisors (1).

9642955381 is an equidigital number, since it uses as much as digits as its factorization.

9642955381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2332800, while the sum is 52.

The square root of 9642955381 is about 98198.5508090624. The cubic root of 9642955381 is about 2128.4823459908.

The spelling of 9642955381 in words is "nine billion, six hundred forty-two million, nine hundred fifty-five thousand, three hundred eighty-one".