454519987921 has 2 divisors, whose sum is σ = 454519987922. Its totient is φ = 454519987920.

The previous prime is 454519987903. The next prime is 454519987993. The reversal of 454519987921 is 129789915454.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 366132697921 + 88387290000 = 605089^2 + 297300^2 .

It is a cyclic number.

It is not a de Polignac number, because 454519987921 - 2¹⁷ = 454519856849 is a prime.

It is not a weakly prime, because it can be changed into another prime (454519987121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 227259993960 + 227259993961.

It is an arithmetic number, because the mean of its divisors is an integer number (227259993961).

Almost surely, 2^454519987921 is an apocalyptic number.

It is an amenable number.

454519987921 is a deficient number, since it is larger than the sum of its proper divisors (1).

454519987921 is an equidigital number, since it uses as much as digits as its factorization.

454519987921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32659200, while the sum is 64.

The spelling of 454519987921 in words is "four hundred fifty-four billion, five hundred nineteen million, nine hundred eighty-seven thousand, nine hundred twenty-one".