84447997 has 2 divisors, whose sum is σ = 84447998. Its totient is φ = 84447996.

The previous prime is 84447991. The next prime is 84448009. The reversal of 84447997 is 79974448.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78659161 + 5788836 = 8869^2 + 2406^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84447997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84447991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42223998 + 42223999.

It is an arithmetic number, because the mean of its divisors is an integer number (42223999).

Almost surely, 2^84447997 is an apocalyptic number.

It is an amenable number.

84447997 is a deficient number, since it is larger than the sum of its proper divisors (1).

84447997 is an equidigital number, since it uses as much as digits as its factorization.

84447997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2032128, while the sum is 52.

The square root of 84447997 is about 9189.5591297951. The cubic root of 84447997 is about 438.7291099163.

It can be divided in two parts, 844 and 47997, that added together give a square (48841 = 221²).

The spelling of 84447997 in words is "eighty-four million, four hundred forty-seven thousand, nine hundred ninety-seven".