991393367 has 2 divisors, whose sum is σ = 991393368. Its totient is φ = 991393366.

The previous prime is 991393303. The next prime is 991393387. The reversal of 991393367 is 763393199.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 991393367 - 2⁶ = 991393303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (991393387) 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, 495696683 + 495696684.

It is an arithmetic number, because the mean of its divisors is an integer number (495696684).

Almost surely, 2^991393367 is an apocalyptic number.

991393367 is a deficient number, since it is larger than the sum of its proper divisors (1).

991393367 is an equidigital number, since it uses as much as digits as its factorization.

991393367 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 826686, while the sum is 50.

The square root of 991393367 is about 31486.3997147975. The cubic root of 991393367 is about 997.1228522934.

The spelling of 991393367 in words is "nine hundred ninety-one million, three hundred ninety-three thousand, three hundred sixty-seven".