84745981 has 4 divisors (see below), whose sum is σ = 84779932. Its totient is φ = 84712032.

The previous prime is 84745979. The next prime is 84746041. The reversal of 84745981 is 18954748.

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 80192025 + 4553956 = 8955^2 + 2134^2 .

It is a cyclic number.

It is not a de Polignac number, because 84745981 - 2¹ = 84745979 is a prime.

It is a super-2 number, since 2×84745981² = 14363762591304722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84745951) 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, 12906 + ... + 18331.

It is an arithmetic number, because the mean of its divisors is an integer number (21194983).

Almost surely, 2^84745981 is an apocalyptic number.

It is an amenable number.

84745981 is a deficient number, since it is larger than the sum of its proper divisors (33951).

84745981 is a wasteful number, since it uses less digits than its factorization.

84745981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33950.

The product of its digits is 322560, while the sum is 46.

The square root of 84745981 is about 9205.7580350561. The cubic root of 84745981 is about 439.2445387025.

The spelling of 84745981 in words is "eighty-four million, seven hundred forty-five thousand, nine hundred eighty-one".