31918037 has 2 divisors, whose sum is σ = 31918038. Its totient is φ = 31918036.

The previous prime is 31918001. The next prime is 31918039. The reversal of 31918037 is 73081913.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31798321 + 119716 = 5639^2 + 346^2 .

It is a cyclic number.

It is not a de Polignac number, because 31918037 - 2⁶ = 31917973 is a prime.

It is a super-2 number, since 2×31918037² = 2037522171866738, which contains 22 as substring.

Together with 31918039, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 31917994 and 31918012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31918039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15959018 + 15959019.

It is an arithmetic number, because the mean of its divisors is an integer number (15959019).

Almost surely, 2^31918037 is an apocalyptic number.

It is an amenable number.

31918037 is a deficient number, since it is larger than the sum of its proper divisors (1).

31918037 is an equidigital number, since it uses as much as digits as its factorization.

31918037 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 31918037 is about 5649.6050304424. The cubic root of 31918037 is about 317.2089199881.

The spelling of 31918037 in words is "thirty-one million, nine hundred eighteen thousand, thirty-seven".