997657351 has 2 divisors, whose sum is σ = 997657352. Its totient is φ = 997657350.

The previous prime is 997657343. The next prime is 997657369. The reversal of 997657351 is 153756799.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 997657351 - 2³ = 997657343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997657321) 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, 498828675 + 498828676.

It is an arithmetic number, because the mean of its divisors is an integer number (498828676).

Almost surely, 2^997657351 is an apocalyptic number.

997657351 is a deficient number, since it is larger than the sum of its proper divisors (1).

997657351 is an equidigital number, since it uses as much as digits as its factorization.

997657351 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1786050, while the sum is 52.

The square root of 997657351 is about 31585.7143500032. The cubic root of 997657351 is about 999.2185064269.

The spelling of 997657351 in words is "nine hundred ninety-seven million, six hundred fifty-seven thousand, three hundred fifty-one".