2231731 has 2 divisors, whose sum is σ = 2231732. Its totient is φ = 2231730.

The previous prime is 2231717. The next prime is 2231737. The reversal of 2231731 is 1371322.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2231731 - 2⁹ = 2231219 is a prime.

It is a super-3 number, since 3×2231731³ = 33346233961625372673, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 2231699 and 2231708.

It is not a weakly prime, because it can be changed into another prime (2231737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1115865 + 1115866.

It is an arithmetic number, because the mean of its divisors is an integer number (1115866).

2^2231731 is an apocalyptic number.

2231731 is a deficient number, since it is larger than the sum of its proper divisors (1).

2231731 is an equidigital number, since it uses as much as digits as its factorization.

2231731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 252, while the sum is 19.

The square root of 2231731 is about 1493.8979215462. The cubic root of 2231731 is about 130.6814512229.

The spelling of 2231731 in words is "two million, two hundred thirty-one thousand, seven hundred thirty-one".