31749413 has 2 divisors, whose sum is σ = 31749414. Its totient is φ = 31749412.

The previous prime is 31749373. The next prime is 31749427. The reversal of 31749413 is 31494713.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31561924 + 187489 = 5618^2 + 433^2 .

It is an emirp because it is prime and its reverse (31494713) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31749413 - 2⁶ = 31749349 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31749413.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31749433) 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, 15874706 + 15874707.

It is an arithmetic number, because the mean of its divisors is an integer number (15874707).

Almost surely, 2^31749413 is an apocalyptic number.

It is an amenable number.

31749413 is a deficient number, since it is larger than the sum of its proper divisors (1).

31749413 is an equidigital number, since it uses as much as digits as its factorization.

31749413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 32.

The square root of 31749413 is about 5634.6617467245. The cubic root of 31749413 is about 316.6493251199.

The spelling of 31749413 in words is "thirty-one million, seven hundred forty-nine thousand, four hundred thirteen".