997511 has 2 divisors, whose sum is σ = 997512. Its totient is φ = 997510.

The previous prime is 997463. The next prime is 997541. The reversal of 997511 is 115799.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 997511 - 2¹⁰ = 996487 is a prime.

It is a Sophie Germain prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498755 + 498756.

It is an arithmetic number, because the mean of its divisors is an integer number (498756).

2⁹⁹⁷⁵¹¹ is an apocalyptic number.

997511 is a deficient number, since it is larger than the sum of its proper divisors (1).

997511 is an equidigital number, since it uses as much as digits as its factorization.

997511 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2835, while the sum is 32.

The square root of 997511 is about 998.7547246446. The cubic root of 997511 is about 99.9169644033.

The spelling of 997511 in words is "nine hundred ninety-seven thousand, five hundred eleven".