31440049 has 2 divisors, whose sum is σ = 31440050. Its totient is φ = 31440048.

The previous prime is 31440001. The next prime is 31440061. The reversal of 31440049 is 94004413.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31438449 + 1600 = 5607^2 + 40^2 .

It is an emirp because it is prime and its reverse (94004413) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31440049 - 2⁹ = 31439537 is a prime.

It is a super-2 number, since 2×31440049² = 1976953362244802, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31440449) 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, 15720024 + 15720025.

It is an arithmetic number, because the mean of its divisors is an integer number (15720025).

Almost surely, 2^31440049 is an apocalyptic number.

It is an amenable number.

31440049 is a deficient number, since it is larger than the sum of its proper divisors (1).

31440049 is an equidigital number, since it uses as much as digits as its factorization.

31440049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 31440049 is about 5607.1426769791. The cubic root of 31440049 is about 315.6174970474.

The spelling of 31440049 in words is "thirty-one million, four hundred forty thousand, forty-nine".