991381262303 has 2 divisors, whose sum is σ = 991381262304. Its totient is φ = 991381262302.

The previous prime is 991381262269. The next prime is 991381262317. The reversal of 991381262303 is 303262183199.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-991381262303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (991381262803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495690631151 + 495690631152.

It is an arithmetic number, because the mean of its divisors is an integer number (495690631152).

Almost surely, 2^991381262303 is an apocalyptic number.

991381262303 is a deficient number, since it is larger than the sum of its proper divisors (1).

991381262303 is an equidigital number, since it uses as much as digits as its factorization.

991381262303 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 419904, while the sum is 47.

The spelling of 991381262303 in words is "nine hundred ninety-one billion, three hundred eighty-one million, two hundred sixty-two thousand, three hundred three".