31307141 has 2 divisors, whose sum is σ = 31307142. Its totient is φ = 31307140.

The previous prime is 31307119. The next prime is 31307161. The reversal of 31307141 is 14170313.

It is a happy number.

It is an a-pointer prime, because the next prime (31307161) can be obtained adding 31307141 to its sum of digits (20).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16638241 + 14668900 = 4079^2 + 3830^2 .

It is a cyclic number.

It is not a de Polignac number, because 31307141 - 2⁶ = 31307077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31307161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15653570 + 15653571.

It is an arithmetic number, because the mean of its divisors is an integer number (15653571).

Almost surely, 2^31307141 is an apocalyptic number.

It is an amenable number.

31307141 is a deficient number, since it is larger than the sum of its proper divisors (1).

31307141 is an equidigital number, since it uses as much as digits as its factorization.

31307141 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 31307141 is about 5595.2784559841. The cubic root of 31307141 is about 315.1721273087.

Adding to 31307141 its reverse (14170313), we get a palindrome (45477454).

The spelling of 31307141 in words is "thirty-one million, three hundred seven thousand, one hundred forty-one".