82784491 has 2 divisors, whose sum is σ = 82784492. Its totient is φ = 82784490.

The previous prime is 82784489. The next prime is 82784563. The reversal of 82784491 is 19448728.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 82784491 - 2¹ = 82784489 is a prime.

Together with 82784489, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (82784411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41392245 + 41392246.

It is an arithmetic number, because the mean of its divisors is an integer number (41392246).

Almost surely, 2^82784491 is an apocalyptic number.

82784491 is a deficient number, since it is larger than the sum of its proper divisors (1).

82784491 is an equidigital number, since it uses as much as digits as its factorization.

82784491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129024, while the sum is 43.

The square root of 82784491 is about 9098.5982986392. The cubic root of 82784491 is about 435.8292035757.

It can be divided in two parts, 8278 and 4491, that added together give a square (12769 = 113²).

The spelling of 82784491 in words is "eighty-two million, seven hundred eighty-four thousand, four hundred ninety-one".