1287982061 has 2 divisors, whose sum is σ = 1287982062. Its totient is φ = 1287982060.

The previous prime is 1287982021. The next prime is 1287982123. The reversal of 1287982061 is 1602897821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 887742025 + 400240036 = 29795^2 + 20006^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1287982061 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1287982001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 643991030 + 643991031.

It is an arithmetic number, because the mean of its divisors is an integer number (643991031).

Almost surely, 2^1287982061 is an apocalyptic number.

It is an amenable number.

1287982061 is a deficient number, since it is larger than the sum of its proper divisors (1).

1287982061 is an equidigital number, since it uses as much as digits as its factorization.

1287982061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 44.

The square root of 1287982061 is about 35888.4669636361. The cubic root of 1287982061 is about 1088.0193137994.

The spelling of 1287982061 in words is "one billion, two hundred eighty-seven million, nine hundred eighty-two thousand, sixty-one".