84860891 has 2 divisors, whose sum is σ = 84860892. Its totient is φ = 84860890.

The previous prime is 84860861. The next prime is 84860899. The reversal of 84860891 is 19806848.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 84860891 - 2¹⁰ = 84859867 is a prime.

It is a super-3 number, since 3×84860891³ (a number of 25 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (84860899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42430445 + 42430446.

It is an arithmetic number, because the mean of its divisors is an integer number (42430446).

Almost surely, 2^84860891 is an apocalyptic number.

84860891 is a deficient number, since it is larger than the sum of its proper divisors (1).

84860891 is an equidigital number, since it uses as much as digits as its factorization.

84860891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 110592, while the sum is 44.

The square root of 84860891 is about 9211.9971233170. The cubic root of 84860891 is about 439.4429779817.

The spelling of 84860891 in words is "eighty-four million, eight hundred sixty thousand, eight hundred ninety-one".