12261731 has 4 divisors (see below), whose sum is σ = 12355464. Its totient is φ = 12168000.

The previous prime is 12261713. The next prime is 12261791. The reversal of 12261731 is 13716221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13716221 = 1129 ⋅12149.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12261731 is a prime.

It is a super-2 number, since 2×12261731² = 300700094232722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12261697 and 12261706.

It is not an unprimeable number, because it can be changed into a prime (12261701) 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, 46670 + ... + 46931.

It is an arithmetic number, because the mean of its divisors is an integer number (3088866).

Almost surely, 2^12261731 is an apocalyptic number.

12261731 is a deficient number, since it is larger than the sum of its proper divisors (93733).

12261731 is an equidigital number, since it uses as much as digits as its factorization.

12261731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93732.

The product of its digits is 504, while the sum is 23.

The square root of 12261731 is about 3501.6754561210. The cubic root of 12261731 is about 230.5953761986.

Adding to 12261731 its reverse (13716221), we get a palindrome (25977952).

The spelling of 12261731 in words is "twelve million, two hundred sixty-one thousand, seven hundred thirty-one".