31268261 has 4 divisors (see below), whose sum is σ = 31287852. Its totient is φ = 31248672.

The previous prime is 31268233. The next prime is 31268323. The reversal of 31268261 is 16286213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16286213 = 139 ⋅117167.

It can be written as a sum of positive squares in 2 ways, for example, as 12180100 + 19088161 = 3490^2 + 4369^2 .

It is a cyclic number.

It is not a de Polignac number, because 31268261 - 2⁶ = 31268197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31268221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7166 + ... + 10671.

It is an arithmetic number, because the mean of its divisors is an integer number (7821963).

Almost surely, 2^31268261 is an apocalyptic number.

It is an amenable number.

31268261 is a deficient number, since it is larger than the sum of its proper divisors (19591).

31268261 is a wasteful number, since it uses less digits than its factorization.

31268261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19590.

The product of its digits is 3456, while the sum is 29.

The square root of 31268261 is about 5591.8030187051. The cubic root of 31268261 is about 315.0416036424.

The spelling of 31268261 in words is "thirty-one million, two hundred sixty-eight thousand, two hundred sixty-one".