451321397 has 2 divisors, whose sum is σ = 451321398. Its totient is φ = 451321396.

The previous prime is 451321393. The next prime is 451321411. The reversal of 451321397 is 793123154.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 271788196 + 179533201 = 16486^2 + 13399^2 .

It is a cyclic number.

It is not a de Polignac number, because 451321397 - 2² = 451321393 is a prime.

It is equal to p_23919326 and since 451321397 and 23919326 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (451321393) 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, 225660698 + 225660699.

It is an arithmetic number, because the mean of its divisors is an integer number (225660699).

Almost surely, 2^451321397 is an apocalyptic number.

It is an amenable number.

451321397 is a deficient number, since it is larger than the sum of its proper divisors (1).

451321397 is an equidigital number, since it uses as much as digits as its factorization.

451321397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22680, while the sum is 35.

The square root of 451321397 is about 21244.3262307845. The cubic root of 451321397 is about 767.0587727300.

The spelling of 451321397 in words is "four hundred fifty-one million, three hundred twenty-one thousand, three hundred ninety-seven".