997673251 has 2 divisors, whose sum is σ = 997673252. Its totient is φ = 997673250.

The previous prime is 997673249. The next prime is 997673269. The reversal of 997673251 is 152376799.

It is a weak prime.

It is an emirp because it is prime and its reverse (152376799) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 997673251 - 2¹ = 997673249 is a prime.

Together with 997673249, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 997673195 and 997673204.

It is not a weakly prime, because it can be changed into another prime (997679251) 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, 498836625 + 498836626.

It is an arithmetic number, because the mean of its divisors is an integer number (498836626).

Almost surely, 2^997673251 is an apocalyptic number.

997673251 is a deficient number, since it is larger than the sum of its proper divisors (1).

997673251 is an equidigital number, since it uses as much as digits as its factorization.

997673251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 714420, while the sum is 49.

The square root of 997673251 is about 31585.9660450650. The cubic root of 997673251 is about 999.2238146922.

The spelling of 997673251 in words is "nine hundred ninety-seven million, six hundred seventy-three thousand, two hundred fifty-one".