1289021025 has 24 divisors (see below), whose sum is σ = 2144775424. Its totient is φ = 683092800.

The previous prime is 1289021023. The next prime is 1289021033. The reversal of 1289021025 is 5201209821.

It is not a de Polignac number, because 1289021025 - 2¹ = 1289021023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1289020983 and 1289021001.

It is not an unprimeable number, because it can be changed into a prime (1289021023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42961 + ... + 66510.

Almost surely, 2^1289021025 is an apocalyptic number.

1289021025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1289021025 is a deficient number, since it is larger than the sum of its proper divisors (855754399).

1289021025 is a wasteful number, since it uses less digits than its factorization.

1289021025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109641 (or 109636 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 1289021025 is about 35902.9389465542. The cubic root of 1289021025 is about 1088.3117891673.

The spelling of 1289021025 in words is "one billion, two hundred eighty-nine million, twenty-one thousand, twenty-five".