11972081 has 4 divisors (see below), whose sum is σ = 13060464. Its totient is φ = 10883700.

The previous prime is 11972021. The next prime is 11972083. The reversal of 11972081 is 18027911.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11972081 is a prime.

It is a super-2 number, since 2×11972081² = 286661446941122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11972083) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 544175 + ... + 544196.

It is an arithmetic number, because the mean of its divisors is an integer number (3265116).

Almost surely, 2^11972081 is an apocalyptic number.

11972081 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11972081 is a deficient number, since it is larger than the sum of its proper divisors (1088383).

11972081 is a wasteful number, since it uses less digits than its factorization.

11972081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1088382.

The product of its (nonzero) digits is 1008, while the sum is 29.

The square root of 11972081 is about 3460.0695079723. The cubic root of 11972081 is about 228.7651590977.

Adding to 11972081 its reverse (18027911), we get a palindrome (29999992).

The spelling of 11972081 in words is "eleven million, nine hundred seventy-two thousand, eighty-one".