991652447 has 2 divisors, whose sum is σ = 991652448. Its totient is φ = 991652446.

The previous prime is 991652393. The next prime is 991652509. The reversal of 991652447 is 744256199.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-991652447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (991652147) 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, 495826223 + 495826224.

It is an arithmetic number, because the mean of its divisors is an integer number (495826224).

Almost surely, 2^991652447 is an apocalyptic number.

991652447 is a deficient number, since it is larger than the sum of its proper divisors (1).

991652447 is an equidigital number, since it uses as much as digits as its factorization.

991652447 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 544320, while the sum is 47.

The square root of 991652447 is about 31490.5136033060. The cubic root of 991652447 is about 997.2097038221.

The spelling of 991652447 in words is "nine hundred ninety-one million, six hundred fifty-two thousand, four hundred forty-seven".