31440249 has 6 divisors (see below), whose sum is σ = 45413706. Its totient is φ = 20960160.

The previous prime is 31440223. The next prime is 31440251. The reversal of 31440249 is 94204413.

It can be written as a sum of positive squares in only one way, i.e., 30603024 + 837225 = 5532^2 + 915^2 .

It is not a de Polignac number, because 31440249 - 2⁵ = 31440217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31440049) 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 in 5 ways as a sum of consecutive naturals, for example, 1746672 + ... + 1746689.

It is an arithmetic number, because the mean of its divisors is an integer number (7568951).

Almost surely, 2^31440249 is an apocalyptic number.

It is an amenable number.

31440249 is a deficient number, since it is larger than the sum of its proper divisors (13973457).

31440249 is a wasteful number, since it uses less digits than its factorization.

31440249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3493367 (or 3493364 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 31440249 is about 5607.1605113462. The cubic root of 31440249 is about 315.6181662932.

The spelling of 31440249 in words is "thirty-one million, four hundred forty thousand, two hundred forty-nine".