9891537361 has 2 divisors, whose sum is σ = 9891537362. Its totient is φ = 9891537360.

The previous prime is 9891537347. The next prime is 9891537401. The reversal of 9891537361 is 1637351989.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7170871761 + 2720665600 = 84681^2 + 52160^2 .

It is a cyclic number.

It is not a de Polignac number, because 9891537361 - 2⁹ = 9891536849 is a prime.

It is a super-2 number, since 2×9891537361² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 9891537299 and 9891537308.

It is not a weakly prime, because it can be changed into another prime (9891537661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4945768680 + 4945768681.

It is an arithmetic number, because the mean of its divisors is an integer number (4945768681).

Almost surely, 2^9891537361 is an apocalyptic number.

It is an amenable number.

9891537361 is a deficient number, since it is larger than the sum of its proper divisors (1).

9891537361 is an equidigital number, since it uses as much as digits as its factorization.

9891537361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1224720, while the sum is 52.

The square root of 9891537361 is about 99456.2082577051. The cubic root of 9891537361 is about 2146.6171688362.

The spelling of 9891537361 in words is "nine billion, eight hundred ninety-one million, five hundred thirty-seven thousand, three hundred sixty-one".