285609997 has 2 divisors, whose sum is σ = 285609998. Its totient is φ = 285609996.

The previous prime is 285609971. The next prime is 285610027. The reversal of 285609997 is 799906582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 283956201 + 1653796 = 16851^2 + 1286^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-285609997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (285609967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142804998 + 142804999.

It is an arithmetic number, because the mean of its divisors is an integer number (142804999).

Almost surely, 2^285609997 is an apocalyptic number.

It is an amenable number.

285609997 is a deficient number, since it is larger than the sum of its proper divisors (1).

285609997 is an equidigital number, since it uses as much as digits as its factorization.

285609997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2449440, while the sum is 55.

The square root of 285609997 is about 16899.9999112426. Note that the first 4 decimals coincide. The cubic root of 285609997 is about 658.5536101773.

The spelling of 285609997 in words is "two hundred eighty-five million, six hundred nine thousand, nine hundred ninety-seven".