85509427 has 2 divisors, whose sum is σ = 85509428. Its totient is φ = 85509426.

The previous prime is 85509421. The next prime is 85509449. The reversal of 85509427 is 72490558.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85509427 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 85509427.

It is not a weakly prime, because it can be changed into another prime (85509421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42754713 + 42754714.

It is an arithmetic number, because the mean of its divisors is an integer number (42754714).

Almost surely, 2^85509427 is an apocalyptic number.

85509427 is a deficient number, since it is larger than the sum of its proper divisors (1).

85509427 is an equidigital number, since it uses as much as digits as its factorization.

85509427 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 100800, while the sum is 40.

The square root of 85509427 is about 9247.1307441822. The cubic root of 85509427 is about 440.5595961941.

The spelling of 85509427 in words is "eighty-five million, five hundred nine thousand, four hundred twenty-seven".