997690933 has 2 divisors, whose sum is σ = 997690934. Its totient is φ = 997690932.

The previous prime is 997690913. The next prime is 997690961. The reversal of 997690933 is 339096799.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 776068164 + 221622769 = 27858^2 + 14887^2 .

It is an emirp because it is prime and its reverse (339096799) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 997690933 - 2⁵ = 997690901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997690913) 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, 498845466 + 498845467.

It is an arithmetic number, because the mean of its divisors is an integer number (498845467).

Almost surely, 2^997690933 is an apocalyptic number.

It is an amenable number.

997690933 is a deficient number, since it is larger than the sum of its proper divisors (1).

997690933 is an equidigital number, since it uses as much as digits as its factorization.

997690933 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2480058, while the sum is 55.

The square root of 997690933 is about 31586.2459466142. The cubic root of 997690933 is about 999.2297178177.

The spelling of 997690933 in words is "nine hundred ninety-seven million, six hundred ninety thousand, nine hundred thirty-three".