285631961 has 2 divisors, whose sum is σ = 285631962. Its totient is φ = 285631960.

The previous prime is 285631949. The next prime is 285632023. The reversal of 285631961 is 169136582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 237745561 + 47886400 = 15419^2 + 6920^2 .

It is a cyclic number.

It is not a de Polignac number, because 285631961 - 2¹⁰ = 285630937 is a prime.

It is not a weakly prime, because it can be changed into another prime (285631061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142815980 + 142815981.

It is an arithmetic number, because the mean of its divisors is an integer number (142815981).

Almost surely, 2^285631961 is an apocalyptic number.

It is an amenable number.

285631961 is a deficient number, since it is larger than the sum of its proper divisors (1).

285631961 is an equidigital number, since it uses as much as digits as its factorization.

285631961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 41.

The square root of 285631961 is about 16900.6497212385. The cubic root of 285631961 is about 658.5704911232.

The spelling of 285631961 in words is "two hundred eighty-five million, six hundred thirty-one thousand, nine hundred sixty-one".