84478451 has 2 divisors, whose sum is σ = 84478452. Its totient is φ = 84478450.

The previous prime is 84478417. The next prime is 84478463. The reversal of 84478451 is 15487448.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 84478451 - 2¹⁰ = 84477427 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 84478399 and 84478408.

It is not a weakly prime, because it can be changed into another prime (84478651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42239225 + 42239226.

It is an arithmetic number, because the mean of its divisors is an integer number (42239226).

Almost surely, 2^84478451 is an apocalyptic number.

84478451 is a deficient number, since it is larger than the sum of its proper divisors (1).

84478451 is an equidigital number, since it uses as much as digits as its factorization.

84478451 is an evil number, because the sum of its binary digits is even.

The product of its digits is 143360, while the sum is 41.

The square root of 84478451 is about 9191.2159696092. The cubic root of 84478451 is about 438.7818423710.

The spelling of 84478451 in words is "eighty-four million, four hundred seventy-eight thousand, four hundred fifty-one".