31043261 has 4 divisors (see below), whose sum is σ = 32392992. Its totient is φ = 29693532.

The previous prime is 31043251. The next prime is 31043267. The reversal of 31043261 is 16234013.

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 not a de Polignac number, because 31043261 - 2⁶ = 31043197 is a prime.

It is a pancake number, because a pancake can be divided into 31043261 parts by 7879 straight cuts.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31043267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 674831 + ... + 674876.

It is an arithmetic number, because the mean of its divisors is an integer number (8098248).

Almost surely, 2^31043261 is an apocalyptic number.

It is an amenable number.

31043261 is a deficient number, since it is larger than the sum of its proper divisors (1349731).

31043261 is a wasteful number, since it uses less digits than its factorization.

31043261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1349730.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 31043261 is about 5571.6479608820. The cubic root of 31043261 is about 314.2841255626.

Adding to 31043261 its reverse (16234013), we get a palindrome (47277274).

The spelling of 31043261 in words is "thirty-one million, forty-three thousand, two hundred sixty-one".