12749191 has 16 divisors (see below), whose sum is σ = 15803200. Its totient is φ = 10075104.

The previous prime is 12749189. The next prime is 12749197. The reversal of 12749191 is 19194721.

12749191 = T₁₃₉₄ + T₁₃₉₅ + ... + T₁₄₀₆.

It is not a de Polignac number, because 12749191 - 2¹ = 12749189 is a prime.

12749191 is a modest number, since divided by 9191 gives 1274 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12749197) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14965 + ... + 15793.

It is an arithmetic number, because the mean of its divisors is an integer number (987700).

Almost surely, 2^12749191 is an apocalyptic number.

12749191 is a deficient number, since it is larger than the sum of its proper divisors (3054009).

12749191 is an frugal number, since it uses more digits than its factorization.

12749191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 875 (or 849 counting only the distinct ones).

The product of its digits is 4536, while the sum is 34.

The square root of 12749191 is about 3570.6009298156. The cubic root of 12749191 is about 233.6114952493.

The spelling of 12749191 in words is "twelve million, seven hundred forty-nine thousand, one hundred ninety-one".