12750991 has 8 divisors (see below), whose sum is σ = 13939200. Its totient is φ = 11567640.

The previous prime is 12750989. The next prime is 12751007. The reversal of 12750991 is 19905721.

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 12750991 - 2¹ = 12750989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12750911) 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, 6370 + ... + 8128.

It is an arithmetic number, because the mean of its divisors is an integer number (1742400).

Almost surely, 2^12750991 is an apocalyptic number.

12750991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12750991 is a deficient number, since it is larger than the sum of its proper divisors (1188209).

12750991 is a wasteful number, since it uses less digits than its factorization.

12750991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2429.

The product of its (nonzero) digits is 5670, while the sum is 34.

The square root of 12750991 is about 3570.8529793314. The cubic root of 12750991 is about 233.6224889116.

The spelling of 12750991 in words is "twelve million, seven hundred fifty thousand, nine hundred ninety-one".