997241309 has 2 divisors, whose sum is σ = 997241310. Its totient is φ = 997241308.

The previous prime is 997241281. The next prime is 997241317. The reversal of 997241309 is 903142799.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 748296025 + 248945284 = 27355^2 + 15778^2 .

It is a cyclic number.

It is not a de Polignac number, because 997241309 - 2²⁰ = 996192733 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 997241309.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997241339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498620654 + 498620655.

It is an arithmetic number, because the mean of its divisors is an integer number (498620655).

Almost surely, 2^997241309 is an apocalyptic number.

It is an amenable number.

997241309 is a deficient number, since it is larger than the sum of its proper divisors (1).

997241309 is an equidigital number, since it uses as much as digits as its factorization.

997241309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 122472, while the sum is 44.

The square root of 997241309 is about 31579.1277428621. The cubic root of 997241309 is about 999.0795894376.

The spelling of 997241309 in words is "nine hundred ninety-seven million, two hundred forty-one thousand, three hundred nine".