84791081 has 4 divisors (see below), whose sum is σ = 85410132. Its totient is φ = 84172032.

The previous prime is 84791071. The next prime is 84791123. The reversal of 84791081 is 18019748.

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 41165056 + 43626025 = 6416^2 + 6605^2 .

It is a cyclic number.

It is not a de Polignac number, because 84791081 - 2¹⁸ = 84528937 is a prime.

It is a super-2 number, since 2×84791081² = 14379054834297122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84791011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 309320 + ... + 309593.

It is an arithmetic number, because the mean of its divisors is an integer number (21352533).

Almost surely, 2^84791081 is an apocalyptic number.

It is an amenable number.

84791081 is a deficient number, since it is larger than the sum of its proper divisors (619051).

84791081 is a wasteful number, since it uses less digits than its factorization.

84791081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619050.

The product of its (nonzero) digits is 16128, while the sum is 38.

The square root of 84791081 is about 9208.2072630887. The cubic root of 84791081 is about 439.3224437365.

The spelling of 84791081 in words is "eighty-four million, seven hundred ninety-one thousand, eighty-one".