84961681 has 8 divisors (see below), whose sum is σ = 97280960. Its totient is φ = 72687888.

The previous prime is 84961663. The next prime is 84961693. The reversal of 84961681 is 18616948.

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

It is not a de Polignac number, because 84961681 - 2⁹ = 84961169 is a prime.

It is a super-2 number, since 2×84961681² = 14436974476691522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (84961651) 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, 7266 + ... + 14923.

It is an arithmetic number, because the mean of its divisors is an integer number (12160120).

Almost surely, 2^84961681 is an apocalyptic number.

It is an amenable number.

84961681 is a deficient number, since it is larger than the sum of its proper divisors (12319279).

84961681 is a wasteful number, since it uses less digits than its factorization.

84961681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22743.

The product of its digits is 82944, while the sum is 43.

The square root of 84961681 is about 9217.4660834744. The cubic root of 84961681 is about 439.6168858666.

The spelling of 84961681 in words is "eighty-four million, nine hundred sixty-one thousand, six hundred eighty-one".