244216991 has 2 divisors, whose sum is σ = 244216992. Its totient is φ = 244216990.

The previous prime is 244216961. The next prime is 244217003. The reversal of 244216991 is 199612442.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 244216991 - 2⁶ = 244216927 is a prime.

It is a super-4 number, since 4×244216991⁴ (a number of 35 digits) contains 4444 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (244216961) 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, 122108495 + 122108496.

It is an arithmetic number, because the mean of its divisors is an integer number (122108496).

Almost surely, 2^244216991 is an apocalyptic number.

244216991 is a deficient number, since it is larger than the sum of its proper divisors (1).

244216991 is an equidigital number, since it uses as much as digits as its factorization.

244216991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 38.

The square root of 244216991 is about 15627.4435209346. The cubic root of 244216991 is about 625.0651588600.

The spelling of 244216991 in words is "two hundred forty-four million, two hundred sixteen thousand, nine hundred ninety-one".