31743161 has 2 divisors, whose sum is σ = 31743162. Its totient is φ = 31743160.

The previous prime is 31743157. The next prime is 31743181. The reversal of 31743161 is 16134713.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31360000 + 383161 = 5600^2 + 619^2 .

It is a cyclic number.

It is not a de Polignac number, because 31743161 - 2² = 31743157 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 31743161.

It is not a weakly prime, because it can be changed into another prime (31743181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15871580 + 15871581.

It is an arithmetic number, because the mean of its divisors is an integer number (15871581).

Almost surely, 2^31743161 is an apocalyptic number.

It is an amenable number.

31743161 is a deficient number, since it is larger than the sum of its proper divisors (1).

31743161 is an equidigital number, since it uses as much as digits as its factorization.

31743161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1512, while the sum is 26.

The square root of 31743161 is about 5634.1069389922. The cubic root of 31743161 is about 316.6285392076.

Adding to 31743161 its reverse (16134713), we get a palindrome (47877874).

The spelling of 31743161 in words is "thirty-one million, seven hundred forty-three thousand, one hundred sixty-one".