84990413 has 2 divisors, whose sum is σ = 84990414. Its totient is φ = 84990412.

The previous prime is 84990377. The next prime is 84990419. The reversal of 84990413 is 31409948.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79959364 + 5031049 = 8942^2 + 2243^2 .

It is a cyclic number.

It is not a de Polignac number, because 84990413 - 2⁶ = 84990349 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84990419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42495206 + 42495207.

It is an arithmetic number, because the mean of its divisors is an integer number (42495207).

Almost surely, 2^84990413 is an apocalyptic number.

It is an amenable number.

84990413 is a deficient number, since it is larger than the sum of its proper divisors (1).

84990413 is an equidigital number, since it uses as much as digits as its factorization.

84990413 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 84990413 is about 9219.0245145568. The cubic root of 84990413 is about 439.6664362390. Note that the first 3 decimals are identical.

The spelling of 84990413 in words is "eighty-four million, nine hundred ninety thousand, four hundred thirteen".