31440449 has 2 divisors, whose sum is σ = 31440450. Its totient is φ = 31440448.

The previous prime is 31440427. The next prime is 31440457. The reversal of 31440449 is 94404413.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28430224 + 3010225 = 5332^2 + 1735^2 .

It is an emirp because it is prime and its reverse (94404413) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31440449 is a prime.

It is not a weakly prime, because it can be changed into another prime (31440419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15720224 + 15720225.

It is an arithmetic number, because the mean of its divisors is an integer number (15720225).

Almost surely, 2^31440449 is an apocalyptic number.

It is an amenable number.

31440449 is a deficient number, since it is larger than the sum of its proper divisors (1).

31440449 is an equidigital number, since it uses as much as digits as its factorization.

31440449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 31440449 is about 5607.1783456566. The cubic root of 31440449 is about 315.6188355362.

The spelling of 31440449 in words is "thirty-one million, four hundred forty thousand, four hundred forty-nine".