84661381 has 8 divisors (see below), whose sum is σ = 96905024. Its totient is φ = 72455040.

The previous prime is 84661373. The next prime is 84661387. The reversal of 84661381 is 18316648.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 84661381 - 2³ = 84661373 is a prime.

It is a super-2 number, since 2×84661381² = 14335098865654322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 84661381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84661387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4275 + ... + 13696.

It is an arithmetic number, because the mean of its divisors is an integer number (12113128).

Almost surely, 2^84661381 is an apocalyptic number.

It is an amenable number.

84661381 is a deficient number, since it is larger than the sum of its proper divisors (12243643).

84661381 is a wasteful number, since it uses less digits than its factorization.

84661381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18651.

The product of its digits is 27648, while the sum is 37.

The square root of 84661381 is about 9201.1619374946. The cubic root of 84661381 is about 439.0983274024.

The spelling of 84661381 in words is "eighty-four million, six hundred sixty-one thousand, three hundred eighty-one".