997749097 has 2 divisors, whose sum is σ = 997749098. Its totient is φ = 997749096.

The previous prime is 997749061. The next prime is 997749143. The reversal of 997749097 is 790947799.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 732189481 + 265559616 = 27059^2 + 16296^2 .

It is an emirp because it is prime and its reverse (790947799) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 997749097 - 2²⁷ = 863531369 is a prime.

It is not a weakly prime, because it can be changed into another prime (997749017) 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, 498874548 + 498874549.

It is an arithmetic number, because the mean of its divisors is an integer number (498874549).

Almost surely, 2^997749097 is an apocalyptic number.

It is an amenable number.

997749097 is a deficient number, since it is larger than the sum of its proper divisors (1).

997749097 is an equidigital number, since it uses as much as digits as its factorization.

997749097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9001692, while the sum is 61.

The square root of 997749097 is about 31587.1666503978. The cubic root of 997749097 is about 999.2491353434.

The spelling of 997749097 in words is "nine hundred ninety-seven million, seven hundred forty-nine thousand, ninety-seven".