31441609 has 2 divisors, whose sum is σ = 31441610. Its totient is φ = 31441608.

The previous prime is 31441607. The next prime is 31441639. The reversal of 31441609 is 90614413.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30769209 + 672400 = 5547^2 + 820^2 .

It is an emirp because it is prime and its reverse (90614413) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31441609 - 2¹ = 31441607 is a prime.

Together with 31441607, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (31441607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15720804 + 15720805.

It is an arithmetic number, because the mean of its divisors is an integer number (15720805).

Almost surely, 2^31441609 is an apocalyptic number.

It is an amenable number.

31441609 is a deficient number, since it is larger than the sum of its proper divisors (1).

31441609 is an equidigital number, since it uses as much as digits as its factorization.

31441609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 31441609 is about 5607.2817835383. The cubic root of 31441609 is about 315.6227170897.

It can be divided in two parts, 3144 and 1609, that added together give a triangular number (4753 = T₉₇).

The spelling of 31441609 in words is "thirty-one million, four hundred forty-one thousand, six hundred nine".