997251379 has 2 divisors, whose sum is σ = 997251380. Its totient is φ = 997251378.

The previous prime is 997251377. The next prime is 997251389. The reversal of 997251379 is 973152799.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 997251379 - 2¹ = 997251377 is a prime.

Together with 997251377, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (997251377) 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, 498625689 + 498625690.

It is an arithmetic number, because the mean of its divisors is an integer number (498625690).

Almost surely, 2^997251379 is an apocalyptic number.

997251379 is a deficient number, since it is larger than the sum of its proper divisors (1).

997251379 is an equidigital number, since it uses as much as digits as its factorization.

997251379 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1071630, while the sum is 52.

The square root of 997251379 is about 31579.2871832155. The cubic root of 997251379 is about 999.0829522806.

The spelling of 997251379 in words is "nine hundred ninety-seven million, two hundred fifty-one thousand, three hundred seventy-nine".