997168511 has 2 divisors, whose sum is σ = 997168512. Its totient is φ = 997168510.

The previous prime is 997168489. The next prime is 997168531. The reversal of 997168511 is 115861799.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 997168511 - 2¹⁴ = 997152127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997168531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498584255 + 498584256.

It is an arithmetic number, because the mean of its divisors is an integer number (498584256).

Almost surely, 2^997168511 is an apocalyptic number.

997168511 is a deficient number, since it is larger than the sum of its proper divisors (1).

997168511 is an equidigital number, since it uses as much as digits as its factorization.

997168511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 47.

The square root of 997168511 is about 31577.9750934096. The cubic root of 997168511 is about 999.0552781149.

The spelling of 997168511 in words is "nine hundred ninety-seven million, one hundred sixty-eight thousand, five hundred eleven".