31018061 has 2 divisors, whose sum is σ = 31018062. Its totient is φ = 31018060.

The previous prime is 31018037. The next prime is 31018087. The reversal of 31018061 is 16081013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25755625 + 5262436 = 5075^2 + 2294^2 .

It is a cyclic number.

It is not a de Polignac number, because 31018061 - 2⁶ = 31017997 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31098061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15509030 + 15509031.

It is an arithmetic number, because the mean of its divisors is an integer number (15509031).

Almost surely, 2^31018061 is an apocalyptic number.

It is an amenable number.

31018061 is a deficient number, since it is larger than the sum of its proper divisors (1).

31018061 is an equidigital number, since it uses as much as digits as its factorization.

31018061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 31018061 is about 5569.3860523401. The cubic root of 31018061 is about 314.1990603586.

Adding to 31018061 its reverse (16081013), we get a palindrome (47099074).

The spelling of 31018061 in words is "thirty-one million, eighteen thousand, sixty-one".