997997237 has 2 divisors, whose sum is σ = 997997238. Its totient is φ = 997997236.

The previous prime is 997997197. The next prime is 997997269. The reversal of 997997237 is 732799799.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 749335876 + 248661361 = 27374^2 + 15769^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-997997237 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 997997237.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997990237) 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, 498998618 + 498998619.

It is an arithmetic number, because the mean of its divisors is an integer number (498998619).

Almost surely, 2^997997237 is an apocalyptic number.

It is an amenable number.

997997237 is a deficient number, since it is larger than the sum of its proper divisors (1).

997997237 is an equidigital number, since it uses as much as digits as its factorization.

997997237 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13502538, while the sum is 62.

The square root of 997997237 is about 31591.0942672140. The cubic root of 997997237 is about 999.3319661635.

The spelling of 997997237 in words is "nine hundred ninety-seven million, nine hundred ninety-seven thousand, two hundred thirty-seven".