1285320961 has 2 divisors, whose sum is σ = 1285320962. Its totient is φ = 1285320960.

The previous prime is 1285320941. The next prime is 1285320991. The reversal of 1285320961 is 1690235821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1258901361 + 26419600 = 35481^2 + 5140^2 .

It is a cyclic number.

It is not a de Polignac number, because 1285320961 - 2⁷ = 1285320833 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1285320961.

It is not a weakly prime, because it can be changed into another prime (1285320941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 642660480 + 642660481.

It is an arithmetic number, because the mean of its divisors is an integer number (642660481).

Almost surely, 2^1285320961 is an apocalyptic number.

It is an amenable number.

1285320961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1285320961 is an equidigital number, since it uses as much as digits as its factorization.

1285320961 is an evil number, because the sum of its binary digits is even.

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

The square root of 1285320961 is about 35851.3732094044. The cubic root of 1285320961 is about 1087.2694781745.

The spelling of 1285320961 in words is "one billion, two hundred eighty-five million, three hundred twenty thousand, nine hundred sixty-one".