1288924961 has 2 divisors, whose sum is σ = 1288924962. Its totient is φ = 1288924960.

The previous prime is 1288924951. The next prime is 1288924969. The reversal of 1288924961 is 1694298821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1283430625 + 5494336 = 35825^2 + 2344^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1288924961 is a prime.

It is a super-2 number, since 2×1288924961² = 3322655110177703042, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1288924969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 644462480 + 644462481.

It is an arithmetic number, because the mean of its divisors is an integer number (644462481).

Almost surely, 2^1288924961 is an apocalyptic number.

It is an amenable number.

1288924961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1288924961 is an equidigital number, since it uses as much as digits as its factorization.

1288924961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 497664, while the sum is 50.

The square root of 1288924961 is about 35901.6010924304. The cubic root of 1288924961 is about 1088.2847530991.

The spelling of 1288924961 in words is "one billion, two hundred eighty-eight million, nine hundred twenty-four thousand, nine hundred sixty-one".