285913261 has 2 divisors, whose sum is σ = 285913262. Its totient is φ = 285913260.

The previous prime is 285913249. The next prime is 285913289. The reversal of 285913261 is 162319582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 146555236 + 139358025 = 12106^2 + 11805^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-285913261 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 285913261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (285913231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142956630 + 142956631.

It is an arithmetic number, because the mean of its divisors is an integer number (142956631).

Almost surely, 2^285913261 is an apocalyptic number.

It is an amenable number.

285913261 is a deficient number, since it is larger than the sum of its proper divisors (1).

285913261 is an equidigital number, since it uses as much as digits as its factorization.

285913261 is an evil number, because the sum of its binary digits is even.

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

The square root of 285913261 is about 16908.9698385206. The cubic root of 285913261 is about 658.7866143427.

The spelling of 285913261 in words is "two hundred eighty-five million, nine hundred thirteen thousand, two hundred sixty-one".