285979481 has 2 divisors, whose sum is σ = 285979482. Its totient is φ = 285979480.

The previous prime is 285979459. The next prime is 285979501. The reversal of 285979481 is 184979582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 156475081 + 129504400 = 12509^2 + 11380^2 .

It is a cyclic number.

It is not a de Polignac number, because 285979481 - 2¹⁰ = 285978457 is a prime.

It is a super-2 number, since 2×285979481² = 163568527106058722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (285979451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142989740 + 142989741.

It is an arithmetic number, because the mean of its divisors is an integer number (142989741).

Almost surely, 2^285979481 is an apocalyptic number.

It is an amenable number.

285979481 is a deficient number, since it is larger than the sum of its proper divisors (1).

285979481 is an equidigital number, since it uses as much as digits as its factorization.

285979481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1451520, while the sum is 53.

The square root of 285979481 is about 16910.9278574536. The cubic root of 285979481 is about 658.8374706548.

The spelling of 285979481 in words is "two hundred eighty-five million, nine hundred seventy-nine thousand, four hundred eighty-one".