31161041 has 2 divisors, whose sum is σ = 31161042. Its totient is φ = 31161040.

The previous prime is 31161019. The next prime is 31161043. The reversal of 31161041 is 14016113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22137025 + 9024016 = 4705^2 + 3004^2 .

It is an emirp because it is prime and its reverse (14016113) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31161041 is a prime.

It is a Sophie Germain prime.

Together with 31161043, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (31161043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15580520 + 15580521.

It is an arithmetic number, because the mean of its divisors is an integer number (15580521).

Almost surely, 2^31161041 is an apocalyptic number.

It is an amenable number.

31161041 is a deficient number, since it is larger than the sum of its proper divisors (1).

31161041 is an equidigital number, since it uses as much as digits as its factorization.

31161041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 31161041 is about 5582.2075382415. The cubic root of 31161041 is about 314.6810949038.

Adding to 31161041 its reverse (14016113), we get a palindrome (45177154).

The spelling of 31161041 in words is "thirty-one million, one hundred sixty-one thousand, forty-one".