9491288990531 has 2 divisors, whose sum is σ = 9491288990532. Its totient is φ = 9491288990530.

The previous prime is 9491288990467. The next prime is 9491288990543. The reversal of 9491288990531 is 1350998821949.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9491288990531 - 2⁶ = 9491288990467 is a prime.

It is a super-2 number, since 2×9491288990531² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9491288990551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4745644495265 + 4745644495266.

It is an arithmetic number, because the mean of its divisors is an integer number (4745644495266).

Almost surely, 2^{9491288990531} is an apocalyptic number.

9491288990531 is a deficient number, since it is larger than the sum of its proper divisors (1).

9491288990531 is an equidigital number, since it uses as much as digits as its factorization.

9491288990531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 50388480, while the sum is 68.

The spelling of 9491288990531 in words is "nine trillion, four hundred ninety-one billion, two hundred eighty-eight million, nine hundred ninety thousand, five hundred thirty-one".