249316327621 has 2 divisors, whose sum is σ = 249316327622. Its totient is φ = 249316327620.

The previous prime is 249316327619. The next prime is 249316327649. The reversal of 249316327621 is 126723613942.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 186463330596 + 62852997025 = 431814^2 + 250705^2 .

It is a cyclic number.

It is not a de Polignac number, because 249316327621 - 2¹ = 249316327619 is a prime.

Together with 249316327619, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249316367621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124658163810 + 124658163811.

It is an arithmetic number, because the mean of its divisors is an integer number (124658163811).

Almost surely, 2^249316327621 is an apocalyptic number.

It is an amenable number.

249316327621 is a deficient number, since it is larger than the sum of its proper divisors (1).

249316327621 is an equidigital number, since it uses as much as digits as its factorization.

249316327621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 653184, while the sum is 46.

The spelling of 249316327621 in words is "two hundred forty-nine billion, three hundred sixteen million, three hundred twenty-seven thousand, six hundred twenty-one".