84780313 has 2 divisors, whose sum is σ = 84780314. Its totient is φ = 84780312.

The previous prime is 84780287. The next prime is 84780331. The reversal of 84780313 is 31308748.

Together with next prime (84780331) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79798489 + 4981824 = 8933^2 + 2232^2 .

It is a cyclic number.

It is not a de Polignac number, because 84780313 - 2⁵ = 84780281 is a prime.

It is not a weakly prime, because it can be changed into another prime (84780373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42390156 + 42390157.

It is an arithmetic number, because the mean of its divisors is an integer number (42390157).

Almost surely, 2^84780313 is an apocalyptic number.

It is an amenable number.

84780313 is a deficient number, since it is larger than the sum of its proper divisors (1).

84780313 is an equidigital number, since it uses as much as digits as its factorization.

84780313 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 84780313 is about 9207.6225487365. The cubic root of 84780313 is about 439.3038457728.

The spelling of 84780313 in words is "eighty-four million, seven hundred eighty thousand, three hundred thirteen".