997891337 has 2 divisors, whose sum is σ = 997891338. Its totient is φ = 997891336.

The previous prime is 997891331. The next prime is 997891387. The reversal of 997891337 is 733198799.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 590295616 + 407595721 = 24296^2 + 20189^2 .

It is a cyclic number.

It is not a de Polignac number, because 997891337 - 2⁶ = 997891273 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (997891331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498945668 + 498945669.

It is an arithmetic number, because the mean of its divisors is an integer number (498945669).

Almost surely, 2^997891337 is an apocalyptic number.

It is an amenable number.

997891337 is a deficient number, since it is larger than the sum of its proper divisors (1).

997891337 is an equidigital number, since it uses as much as digits as its factorization.

997891337 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2571912, while the sum is 56.

The square root of 997891337 is about 31589.4181174646. The cubic root of 997891337 is about 999.2966177027.

The spelling of 997891337 in words is "nine hundred ninety-seven million, eight hundred ninety-one thousand, three hundred thirty-seven".