997601291 has 2 divisors, whose sum is σ = 997601292. Its totient is φ = 997601290.

The previous prime is 997601279. The next prime is 997601303. The reversal of 997601291 is 192106799.

997601291 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (997601279) and next prime (997601303).

It is an emirp because it is prime and its reverse (192106799) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 997601291 - 2¹⁰ = 997600267 is a prime.

It is not a weakly prime, because it can be changed into another prime (997601491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498800645 + 498800646.

It is an arithmetic number, because the mean of its divisors is an integer number (498800646).

Almost surely, 2^997601291 is an apocalyptic number.

997601291 is a deficient number, since it is larger than the sum of its proper divisors (1).

997601291 is an equidigital number, since it uses as much as digits as its factorization.

997601291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 61236, while the sum is 44.

The square root of 997601291 is about 31584.8269110344. The cubic root of 997601291 is about 999.1997901684.

The spelling of 997601291 in words is "nine hundred ninety-seven million, six hundred one thousand, two hundred ninety-one".