84661945 has 4 divisors (see below), whose sum is σ = 101594340. Its totient is φ = 67729552.

The previous prime is 84661939. The next prime is 84662059. The reversal of 84661945 is 54916648.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21427641 + 63234304 = 4629^2 + 7952^2 .

It is a cyclic number.

It is not a de Polignac number, because 84661945 - 2¹³ = 84653753 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8466190 + ... + 8466199.

It is an arithmetic number, because the mean of its divisors is an integer number (25398585).

Almost surely, 2^84661945 is an apocalyptic number.

It is an amenable number.

84661945 is a deficient number, since it is larger than the sum of its proper divisors (16932395).

84661945 is a wasteful number, since it uses less digits than its factorization.

84661945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16932394.

The product of its digits is 207360, while the sum is 43.

The square root of 84661945 is about 9201.1925857467. The cubic root of 84661945 is about 439.0993024668.

The spelling of 84661945 in words is "eighty-four million, six hundred sixty-one thousand, nine hundred forty-five".