12757121 has 8 divisors (see below), whose sum is σ = 13766760. Its totient is φ = 11751552.

The previous prime is 12757099. The next prime is 12757127. The reversal of 12757121 is 12175721.

It can be written as a sum of positive squares in 4 ways, for example, as 190096 + 12567025 = 436^2 + 3545^2 .

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 12757121 - 2⁶ = 12757057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12757127) 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, 9911 + ... + 11123.

It is an arithmetic number, because the mean of its divisors is an integer number (1720845).

Almost surely, 2^12757121 is an apocalyptic number.

It is an amenable number.

12757121 is a deficient number, since it is larger than the sum of its proper divisors (1009639).

12757121 is a wasteful number, since it uses less digits than its factorization.

12757121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2035.

The product of its digits is 980, while the sum is 26.

The square root of 12757121 is about 3571.7112145301. The cubic root of 12757121 is about 233.6599206800.

The spelling of 12757121 in words is "twelve million, seven hundred fifty-seven thousand, one hundred twenty-one".