285231977 has 2 divisors, whose sum is σ = 285231978. Its totient is φ = 285231976.

The previous prime is 285231959. The next prime is 285231983. The reversal of 285231977 is 779132582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 241460521 + 43771456 = 15539^2 + 6616^2 .

It is a cyclic number.

It is not a de Polignac number, because 285231977 - 2⁸ = 285231721 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (285231677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142615988 + 142615989.

It is an arithmetic number, because the mean of its divisors is an integer number (142615989).

Almost surely, 2^285231977 is an apocalyptic number.

It is an amenable number.

285231977 is a deficient number, since it is larger than the sum of its proper divisors (1).

285231977 is an equidigital number, since it uses as much as digits as its factorization.

285231977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 211680, while the sum is 44.

The square root of 285231977 is about 16888.8121844018. The cubic root of 285231977 is about 658.2629383399.

The spelling of 285231977 in words is "two hundred eighty-five million, two hundred thirty-one thousand, nine hundred seventy-seven".