1256200489 has 4 divisors (see below), whose sum is σ = 1264201924. Its totient is φ = 1248199056.

The previous prime is 1256200471. The next prime is 1256200513. The reversal of 1256200489 is 9840026521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 620757225 + 635443264 = 24915^2 + 25208^2 .

It is a cyclic number.

It is not a de Polignac number, because 1256200489 - 2⁹ = 1256199977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1256200469) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4000482 + ... + 4000795.

It is an arithmetic number, because the mean of its divisors is an integer number (316050481).

Almost surely, 2^1256200489 is an apocalyptic number.

It is an amenable number.

1256200489 is a deficient number, since it is larger than the sum of its proper divisors (8001435).

1256200489 is an equidigital number, since it uses as much as digits as its factorization.

1256200489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8001434.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 1256200489 is about 35442.9187426769. The cubic root of 1256200489 is about 1078.9955478679.

The spelling of 1256200489 in words is "one billion, two hundred fifty-six million, two hundred thousand, four hundred eighty-nine".