991652393 has 2 divisors, whose sum is σ = 991652394. Its totient is φ = 991652392.

The previous prime is 991652341. The next prime is 991652447. The reversal of 991652393 is 393256199.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 558471424 + 433180969 = 23632^2 + 20813^2 .

It is a cyclic number.

It is not a de Polignac number, because 991652393 - 2¹² = 991648297 is a prime.

It is not a weakly prime, because it can be changed into another prime (991652323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495826196 + 495826197.

It is an arithmetic number, because the mean of its divisors is an integer number (495826197).

Almost surely, 2^991652393 is an apocalyptic number.

It is an amenable number.

991652393 is a deficient number, since it is larger than the sum of its proper divisors (1).

991652393 is an equidigital number, since it uses as much as digits as its factorization.

991652393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 393660, while the sum is 47.

The square root of 991652393 is about 31490.5127459049. The cubic root of 991652393 is about 997.2096857212.

The spelling of 991652393 in words is "nine hundred ninety-one million, six hundred fifty-two thousand, three hundred ninety-three".