84654991 has 2 divisors, whose sum is σ = 84654992. Its totient is φ = 84654990.

The previous prime is 84654989. The next prime is 84655009. The reversal of 84654991 is 19945648.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 84654991 - 2¹ = 84654989 is a prime.

Together with 84654989, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84654971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42327495 + 42327496.

It is an arithmetic number, because the mean of its divisors is an integer number (42327496).

Almost surely, 2^84654991 is an apocalyptic number.

84654991 is a deficient number, since it is larger than the sum of its proper divisors (1).

84654991 is an equidigital number, since it uses as much as digits as its factorization.

84654991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 311040, while the sum is 46.

The square root of 84654991 is about 9200.8146921889. The cubic root of 84654991 is about 439.0872798272.

It can be divided in two parts, 8465 and 4991, that added together give a square (13456 = 116²).

The spelling of 84654991 in words is "eighty-four million, six hundred fifty-four thousand, nine hundred ninety-one".