497665391 has 2 divisors, whose sum is σ = 497665392. Its totient is φ = 497665390.

The previous prime is 497665381. The next prime is 497665397. The reversal of 497665391 is 193566794.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-497665391 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (497665397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 248832695 + 248832696.

It is an arithmetic number, because the mean of its divisors is an integer number (248832696).

Almost surely, 2^497665391 is an apocalyptic number.

497665391 is a deficient number, since it is larger than the sum of its proper divisors (1).

497665391 is an equidigital number, since it uses as much as digits as its factorization.

497665391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1224720, while the sum is 50.

The square root of 497665391 is about 22308.4152507523. The cubic root of 497665391 is about 792.4632780604.

The spelling of 497665391 in words is "four hundred ninety-seven million, six hundred sixty-five thousand, three hundred ninety-one".