9491540588381 has 2 divisors, whose sum is σ = 9491540588382. Its totient is φ = 9491540588380.

The previous prime is 9491540588377. The next prime is 9491540588449. The reversal of 9491540588381 is 1838850451949.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6091315227481 + 3400225360900 = 2468059^2 + 1843970^2 .

It is a cyclic number.

It is not a de Polignac number, because 9491540588381 - 2² = 9491540588377 is a prime.

It is a super-2 number, since 2×9491540588381² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9491540188381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4745770294190 + 4745770294191.

It is an arithmetic number, because the mean of its divisors is an integer number (4745770294191).

Almost surely, 2^{9491540588381} is an apocalyptic number.

It is an amenable number.

9491540588381 is a deficient number, since it is larger than the sum of its proper divisors (1).

9491540588381 is an equidigital number, since it uses as much as digits as its factorization.

9491540588381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 49766400, while the sum is 65.

The spelling of 9491540588381 in words is "nine trillion, four hundred ninety-one billion, five hundred forty million, five hundred eighty-eight thousand, three hundred eighty-one".