440131997 has 2 divisors, whose sum is σ = 440131998. Its totient is φ = 440131996.

The previous prime is 440131973. The next prime is 440131999. The reversal of 440131997 is 799131044.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 274598041 + 165533956 = 16571^2 + 12866^2 .

It is a cyclic number.

It is not a de Polignac number, because 440131997 - 2²⁴ = 423354781 is a prime.

Together with 440131999, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 440131997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (440131999) 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, 220065998 + 220065999.

It is an arithmetic number, because the mean of its divisors is an integer number (220065999).

Almost surely, 2^440131997 is an apocalyptic number.

It is an amenable number.

440131997 is a deficient number, since it is larger than the sum of its proper divisors (1).

440131997 is an equidigital number, since it uses as much as digits as its factorization.

440131997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 440131997 is about 20979.3230825020. The cubic root of 440131997 is about 760.6665418686. Note that the first 3 decimals are identical.

The spelling of 440131997 in words is "four hundred forty million, one hundred thirty-one thousand, nine hundred ninety-seven".