12011961 has 16 divisors (see below), whose sum is σ = 17509184. Its totient is φ = 7280064.

The previous prime is 12011953. The next prime is 12011969. The reversal of 12011961 is 16911021.

It is an interprime number because it is at equal distance from previous prime (12011953) and next prime (12011969).

It is not a de Polignac number, because 12011961 - 2³ = 12011953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12011969) 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, 315 + ... + 4911.

It is an arithmetic number, because the mean of its divisors is an integer number (1094324).

Almost surely, 2^12011961 is an apocalyptic number.

It is an amenable number.

12011961 is a deficient number, since it is larger than the sum of its proper divisors (5497223).

12011961 is a wasteful number, since it uses less digits than its factorization.

12011961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4680.

The product of its (nonzero) digits is 108, while the sum is 21.

The square root of 12011961 is about 3465.8276067918. The cubic root of 12011961 is about 229.0188895131.

Adding to 12011961 its reverse (16911021), we get a palindrome (28922982).

The spelling of 12011961 in words is "twelve million, eleven thousand, nine hundred sixty-one".