84210661 has 4 divisors (see below), whose sum is σ = 84297312. Its totient is φ = 84124012.

The previous prime is 84210629. The next prime is 84210667. The reversal of 84210661 is 16601248.

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 a cyclic number.

It is not a de Polignac number, because 84210661 - 2⁵ = 84210629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84210667) 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, 41851 + ... + 43816.

It is an arithmetic number, because the mean of its divisors is an integer number (21074328).

Almost surely, 2^84210661 is an apocalyptic number.

It is an amenable number.

84210661 is a deficient number, since it is larger than the sum of its proper divisors (86651).

84210661 is an equidigital number, since it uses as much as digits as its factorization.

84210661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86650.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 84210661 is about 9176.6366932553. The cubic root of 84210661 is about 438.3177170468.

The spelling of 84210661 in words is "eighty-four million, two hundred ten thousand, six hundred sixty-one".