1254799561 has 8 divisors (see below), whose sum is σ = 1296941184. Its totient is φ = 1213301520.

The previous prime is 1254799489. The next prime is 1254799571. The reversal of 1254799561 is 1659974521.

It is a happy number.

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 1254799561 - 2¹⁹ = 1254275273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1254799571) 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, 156930 + ... + 164731.

It is an arithmetic number, because the mean of its divisors is an integer number (162117648).

Almost surely, 2^1254799561 is an apocalyptic number.

It is an amenable number.

1254799561 is a deficient number, since it is larger than the sum of its proper divisors (42141623).

1254799561 is an equidigital number, since it uses as much as digits as its factorization.

1254799561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321791.

The product of its digits is 680400, while the sum is 49.

The square root of 1254799561 is about 35423.1500716692. The cubic root of 1254799561 is about 1078.5942962757.

The spelling of 1254799561 in words is "one billion, two hundred fifty-four million, seven hundred ninety-nine thousand, five hundred sixty-one".