12261431 has 8 divisors (see below), whose sum is σ = 15091104. Its totient is φ = 9701280.

The previous prime is 12261409. The next prime is 12261443. The reversal of 12261431 is 13416221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12261431 is a prime.

It is a super-2 number, since 2×12261431² = 300685380335522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12261481) 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 7 ways as a sum of consecutive naturals, for example, 67280 + ... + 67461.

It is an arithmetic number, because the mean of its divisors is an integer number (1886388).

Almost surely, 2^12261431 is an apocalyptic number.

12261431 is a deficient number, since it is larger than the sum of its proper divisors (2829673).

12261431 is a wasteful number, since it uses less digits than its factorization.

12261431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134761.

The product of its digits is 288, while the sum is 20.

The square root of 12261431 is about 3501.6326192221. The cubic root of 12261431 is about 230.5934955729.

Adding to 12261431 its reverse (13416221), we get a palindrome (25677652).

The spelling of 12261431 in words is "twelve million, two hundred sixty-one thousand, four hundred thirty-one".