31121230207 has 2 divisors, whose sum is σ = 31121230208. Its totient is φ = 31121230206.

The previous prime is 31121230193. The next prime is 31121230267. The reversal of 31121230207 is 70203212113.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (70203212113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31121230207 - 2⁷ = 31121230079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31121230267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15560615103 + 15560615104.

It is an arithmetic number, because the mean of its divisors is an integer number (15560615104).

Almost surely, 2^31121230207 is an apocalyptic number.

31121230207 is a deficient number, since it is larger than the sum of its proper divisors (1).

31121230207 is an equidigital number, since it uses as much as digits as its factorization.

31121230207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 22.

The spelling of 31121230207 in words is "thirty-one billion, one hundred twenty-one million, two hundred thirty thousand, two hundred seven".