451209481 has 2 divisors, whose sum is σ = 451209482. Its totient is φ = 451209480.

The previous prime is 451209443. The next prime is 451209523. The reversal of 451209481 is 184902154.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 442892025 + 8317456 = 21045^2 + 2884^2 .

It is a cyclic number.

It is not a de Polignac number, because 451209481 - 2¹⁷ = 451078409 is a prime.

It is a super-2 number, since 2×451209481² = 407179991488578722, which contains 22 as substring.

It is equal to p_23913637 and since 451209481 and 23913637 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (451209401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 225604740 + 225604741.

It is an arithmetic number, because the mean of its divisors is an integer number (225604741).

Almost surely, 2^451209481 is an apocalyptic number.

It is an amenable number.

451209481 is a deficient number, since it is larger than the sum of its proper divisors (1).

451209481 is an equidigital number, since it uses as much as digits as its factorization.

451209481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 451209481 is about 21241.6920465390. The cubic root of 451209481 is about 766.9953639286.

The spelling of 451209481 in words is "four hundred fifty-one million, two hundred nine thousand, four hundred eighty-one".