84681381 has 4 divisors (see below), whose sum is σ = 112908512. Its totient is φ = 56454252.

The previous prime is 84681379. The next prime is 84681397. The reversal of 84681381 is 18318648.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 84681381 - 2¹ = 84681379 is a prime.

It is a super-2 number, since 2×84681381² = 14341872576134322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84681341) 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, 14113561 + ... + 14113566.

It is an arithmetic number, because the mean of its divisors is an integer number (28227128).

Almost surely, 2^84681381 is an apocalyptic number.

It is an amenable number.

84681381 is a deficient number, since it is larger than the sum of its proper divisors (28227131).

84681381 is a wasteful number, since it uses less digits than its factorization.

84681381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28227130.

The product of its digits is 36864, while the sum is 39.

The square root of 84681381 is about 9202.2486925751. The cubic root of 84681381 is about 439.1329015100.

The spelling of 84681381 in words is "eighty-four million, six hundred eighty-one thousand, three hundred eighty-one".