84559991 has 2 divisors, whose sum is σ = 84559992. Its totient is φ = 84559990.

The previous prime is 84559987. The next prime is 84560101. The reversal of 84559991 is 19995548.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 84559991 - 2² = 84559987 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84559091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42279995 + 42279996.

It is an arithmetic number, because the mean of its divisors is an integer number (42279996).

Almost surely, 2^84559991 is an apocalyptic number.

84559991 is a deficient number, since it is larger than the sum of its proper divisors (1).

84559991 is an equidigital number, since it uses as much as digits as its factorization.

84559991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 583200, while the sum is 50.

The square root of 84559991 is about 9195.6506566963. The cubic root of 84559991 is about 438.9229701415.

The spelling of 84559991 in words is "eighty-four million, five hundred fifty-nine thousand, nine hundred ninety-one".