31121479 has 2 divisors, whose sum is σ = 31121480. Its totient is φ = 31121478.

The previous prime is 31121413. The next prime is 31121483. The reversal of 31121479 is 97412113.

It is a strong prime.

It is an emirp because it is prime and its reverse (97412113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31121479 - 2¹⁹ = 30597191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31122479) 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, 15560739 + 15560740.

It is an arithmetic number, because the mean of its divisors is an integer number (15560740).

Almost surely, 2^31121479 is an apocalyptic number.

31121479 is a deficient number, since it is larger than the sum of its proper divisors (1).

31121479 is an equidigital number, since it uses as much as digits as its factorization.

31121479 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1512, while the sum is 28.

The square root of 31121479 is about 5578.6628326150. The cubic root of 31121479 is about 314.5478656601.

The spelling of 31121479 in words is "thirty-one million, one hundred twenty-one thousand, four hundred seventy-nine".