451005881 has 2 divisors, whose sum is σ = 451005882. Its totient is φ = 451005880.

The previous prime is 451005871. The next prime is 451005917. The reversal of 451005881 is 188500154.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 450925225 + 80656 = 21235^2 + 284^2 .

It is a cyclic number.

It is not a de Polignac number, because 451005881 - 2¹⁰ = 451004857 is a prime.

It is a super-2 number, since 2×451005881² = 406812609393172322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (451005851) 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, 225502940 + 225502941.

It is an arithmetic number, because the mean of its divisors is an integer number (225502941).

Almost surely, 2^451005881 is an apocalyptic number.

It is an amenable number.

451005881 is a deficient number, since it is larger than the sum of its proper divisors (1).

451005881 is an equidigital number, since it uses as much as digits as its factorization.

451005881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6400, while the sum is 32.

The square root of 451005881 is about 21236.8990438811. The cubic root of 451005881 is about 766.8799823769.

The spelling of 451005881 in words is "four hundred fifty-one million, five thousand, eight hundred eighty-one".