31110397 has 2 divisors, whose sum is σ = 31110398. Its totient is φ = 31110396.

The previous prime is 31110361. The next prime is 31110407. The reversal of 31110397 is 79301113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19131876 + 11978521 = 4374^2 + 3461^2 .

It is an emirp because it is prime and its reverse (79301113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31110397 - 2¹¹ = 31108349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31110307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15555198 + 15555199.

It is an arithmetic number, because the mean of its divisors is an integer number (15555199).

Almost surely, 2^31110397 is an apocalyptic number.

It is an amenable number.

31110397 is a deficient number, since it is larger than the sum of its proper divisors (1).

31110397 is an equidigital number, since it uses as much as digits as its factorization.

31110397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 567, while the sum is 25.

The square root of 31110397 is about 5577.6694954076. The cubic root of 31110397 is about 314.5105256043.

The spelling of 31110397 in words is "thirty-one million, one hundred ten thousand, three hundred ninety-seven".