12117751 has 6 divisors (see below), whose sum is σ = 12272480. Its totient is φ = 11964948.

The previous prime is 12117733. The next prime is 12117779. The reversal of 12117751 is 15771121.

It is a de Polignac number, because none of the positive numbers 2^k-12117751 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 (12117551) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6010 + ... + 7768.

Almost surely, 2^12117751 is an apocalyptic number.

12117751 is a deficient number, since it is larger than the sum of its proper divisors (154729).

12117751 is an frugal number, since it uses more digits than its factorization.

12117751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1925 (or 1842 counting only the distinct ones).

The product of its digits is 490, while the sum is 25.

The square root of 12117751 is about 3481.0560179348. The cubic root of 12117751 is about 229.6892526838.

Adding to 12117751 its reverse (15771121), we get a palindrome (27888872).

The spelling of 12117751 in words is "twelve million, one hundred seventeen thousand, seven hundred fifty-one".