31424642449 has 2 divisors, whose sum is σ = 31424642450. Its totient is φ = 31424642448.

The previous prime is 31424642329. The next prime is 31424642489. The reversal of 31424642449 is 94424642413.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20497076224 + 10927566225 = 143168^2 + 104535^2 .

It is a cyclic number.

It is not a de Polignac number, because 31424642449 - 2⁷ = 31424642321 is a prime.

It is not a weakly prime, because it can be changed into another prime (31424642489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15712321224 + 15712321225.

It is an arithmetic number, because the mean of its divisors is an integer number (15712321225).

Almost surely, 2^31424642449 is an apocalyptic number.

It is an amenable number.

31424642449 is a deficient number, since it is larger than the sum of its proper divisors (1).

31424642449 is an equidigital number, since it uses as much as digits as its factorization.

31424642449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 663552, while the sum is 43.

The spelling of 31424642449 in words is "thirty-one billion, four hundred twenty-four million, six hundred forty-two thousand, four hundred forty-nine".