85649647 has 2 divisors, whose sum is σ = 85649648. Its totient is φ = 85649646.

The previous prime is 85649591. The next prime is 85649653. The reversal of 85649647 is 74694658.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85649647 is a prime.

It is a Chen prime.

It is equal to p_4979299 and since 85649647 and 4979299 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 85649647.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85649147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42824823 + 42824824.

It is an arithmetic number, because the mean of its divisors is an integer number (42824824).

Almost surely, 2^85649647 is an apocalyptic number.

85649647 is a deficient number, since it is larger than the sum of its proper divisors (1).

85649647 is an equidigital number, since it uses as much as digits as its factorization.

85649647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1451520, while the sum is 49.

The square root of 85649647 is about 9254.7094497883. The cubic root of 85649647 is about 440.8002773787.

The spelling of 85649647 in words is "eighty-five million, six hundred forty-nine thousand, six hundred forty-seven".