84721493 has 2 divisors, whose sum is σ = 84721494. Its totient is φ = 84721492.

The previous prime is 84721471. The next prime is 84721519. The reversal of 84721493 is 39412748.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84235684 + 485809 = 9178^2 + 697^2 .

It is a cyclic number.

It is not a de Polignac number, because 84721493 - 2¹⁶ = 84655957 is a prime.

It is a super-2 number, since 2×84721493² = 14355462752298098, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84721193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42360746 + 42360747.

It is an arithmetic number, because the mean of its divisors is an integer number (42360747).

Almost surely, 2^84721493 is an apocalyptic number.

It is an amenable number.

84721493 is a deficient number, since it is larger than the sum of its proper divisors (1).

84721493 is an equidigital number, since it uses as much as digits as its factorization.

84721493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 38.

The square root of 84721493 is about 9204.4279018307. The cubic root of 84721493 is about 439.2022269361.

The spelling of 84721493 in words is "eighty-four million, seven hundred twenty-one thousand, four hundred ninety-three".