12181501 has 8 divisors (see below), whose sum is σ = 12377664. Its totient is φ = 11987040.

The previous prime is 12181493. The next prime is 12181523. The reversal of 12181501 is 10518121.

It is a happy number.

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 12181501 - 2³ = 12181493 is a prime.

It is a super-2 number, since 2×12181501² = 296777933226002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12181531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23121 + ... + 23641.

It is an arithmetic number, because the mean of its divisors is an integer number (1547208).

Almost surely, 2^12181501 is an apocalyptic number.

It is an amenable number.

12181501 is a deficient number, since it is larger than the sum of its proper divisors (196163).

12181501 is a wasteful number, since it uses less digits than its factorization.

12181501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 851.

The product of its (nonzero) digits is 80, while the sum is 19.

The square root of 12181501 is about 3490.2007105609. The cubic root of 12181501 is about 230.0913373844.

Adding to 12181501 its reverse (10518121), we get a palindrome (22699622).

The spelling of 12181501 in words is "twelve million, one hundred eighty-one thousand, five hundred one".