1251289 has 8 divisors (see below), whose sum is σ = 1362312. Its totient is φ = 1142400.

The previous prime is 1251287. The next prime is 1251301. The reversal of 1251289 is 9821521.

It can be written as a sum of positive squares in 4 ways, for example, as 235225 + 1016064 = 485^2 + 1008^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1251289 - 2¹ = 1251287 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1251287) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 837 + ... + 1789.

It is an arithmetic number, because the mean of its divisors is an integer number (170289).

2^1251289 is an apocalyptic number.

It is an amenable number.

1251289 is a deficient number, since it is larger than the sum of its proper divisors (111023).

1251289 is a wasteful number, since it uses less digits than its factorization.

1251289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1067.

The product of its digits is 1440, while the sum is 28.

The square root of 1251289 is about 1118.6102985401. The cubic root of 1251289 is about 107.7587493321.

It can be divided in two parts, 1251 and 289, that added together give a triangular number (1540 = T₅₅).

The spelling of 1251289 in words is "one million, two hundred fifty-one thousand, two hundred eighty-nine".