85029409 has 2 divisors, whose sum is σ = 85029410. Its totient is φ = 85029408.

The previous prime is 85029407. The next prime is 85029467. The reversal of 85029409 is 90492058.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78269409 + 6760000 = 8847^2 + 2600^2 .

It is a cyclic number.

It is not a de Polignac number, because 85029409 - 2¹ = 85029407 is a prime.

Together with 85029407, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (85029403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42514704 + 42514705.

It is an arithmetic number, because the mean of its divisors is an integer number (42514705).

Almost surely, 2^85029409 is an apocalyptic number.

It is an amenable number.

85029409 is a deficient number, since it is larger than the sum of its proper divisors (1).

85029409 is an equidigital number, since it uses as much as digits as its factorization.

85029409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 85029409 is about 9221.1392463188. The cubic root of 85029409 is about 439.7336697467.

The spelling of 85029409 in words is "eighty-five million, twenty-nine thousand, four hundred nine".