12261971 has 4 divisors (see below), whose sum is σ = 12522912. Its totient is φ = 12001032.

The previous prime is 12261961. The next prime is 12262021. The reversal of 12261971 is 17916221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12261971 - 2²² = 8067667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12261901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130400 + ... + 130493.

It is an arithmetic number, because the mean of its divisors is an integer number (3130728).

Almost surely, 2^12261971 is an apocalyptic number.

12261971 is a deficient number, since it is larger than the sum of its proper divisors (260941).

12261971 is an equidigital number, since it uses as much as digits as its factorization.

12261971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260940.

The product of its digits is 1512, while the sum is 29.

The square root of 12261971 is about 3501.7097252628. The cubic root of 12261971 is about 230.5968806770.

The spelling of 12261971 in words is "twelve million, two hundred sixty-one thousand, nine hundred seventy-one".