1275749999 has 8 divisors (see below), whose sum is σ = 1314429120. Its totient is φ = 1237551616.

The previous prime is 1275749987. The next prime is 1275750001. The reversal of 1275749999 is 9999475721.

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 1275749999 - 2¹⁶ = 1275684463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1275749099) 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, 114794 + ... + 125415.

It is an arithmetic number, because the mean of its divisors is an integer number (164303640).

Almost surely, 2^1275749999 is an apocalyptic number.

1275749999 is a deficient number, since it is larger than the sum of its proper divisors (38679121).

1275749999 is a wasteful number, since it uses less digits than its factorization.

1275749999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240369.

The product of its digits is 12859560, while the sum is 62.

The square root of 1275749999 is about 35717.6426853733. The cubic root of 1275749999 is about 1084.5640185955.

The spelling of 1275749999 in words is "one billion, two hundred seventy-five million, seven hundred forty-nine thousand, nine hundred ninety-nine".