997501709 has 2 divisors, whose sum is σ = 997501710. Its totient is φ = 997501708.

The previous prime is 997501657. The next prime is 997501723. The reversal of 997501709 is 907105799.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 775789609 + 221712100 = 27853^2 + 14890^2 .

It is a cyclic number.

It is not a de Polignac number, because 997501709 - 2²⁸ = 729066253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997500709) 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, 498750854 + 498750855.

It is an arithmetic number, because the mean of its divisors is an integer number (498750855).

Almost surely, 2^997501709 is an apocalyptic number.

It is an amenable number.

997501709 is a deficient number, since it is larger than the sum of its proper divisors (1).

997501709 is an equidigital number, since it uses as much as digits as its factorization.

997501709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 178605, while the sum is 47.

The square root of 997501709 is about 31583.2504501991. The cubic root of 997501709 is about 999.1665418739.

The spelling of 997501709 in words is "nine hundred ninety-seven million, five hundred one thousand, seven hundred nine".