12749991 has 8 divisors (see below), whose sum is σ = 17095680. Its totient is φ = 8452152.

The previous prime is 12749953. The next prime is 12750011. The reversal of 12749991 is 19994721.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12749991 - 2²¹ = 10652839 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12749921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11335 + ... + 12408.

It is an arithmetic number, because the mean of its divisors is an integer number (2136960).

Almost surely, 2^12749991 is an apocalyptic number.

12749991 is a deficient number, since it is larger than the sum of its proper divisors (4345689).

12749991 is a wasteful number, since it uses less digits than its factorization.

12749991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23925.

The product of its digits is 40824, while the sum is 42.

The square root of 12749991 is about 3570.7129540191. The cubic root of 12749991 is about 233.6163814492.

The spelling of 12749991 in words is "twelve million, seven hundred forty-nine thousand, nine hundred ninety-one".