244138751993 has 2 divisors, whose sum is σ = 244138751994. Its totient is φ = 244138751992.

The previous prime is 244138751963. The next prime is 244138752017. The reversal of 244138751993 is 399157831442.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 169919557369 + 74219194624 = 412213^2 + 272432^2 .

It is a cyclic number.

It is not a de Polignac number, because 244138751993 - 2⁶ = 244138751929 is a prime.

It is a super-2 number, since 2×244138751993² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (244138751903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122069375996 + 122069375997.

It is an arithmetic number, because the mean of its divisors is an integer number (122069375997).

Almost surely, 2^244138751993 is an apocalyptic number.

It is an amenable number.

244138751993 is a deficient number, since it is larger than the sum of its proper divisors (1).

244138751993 is an equidigital number, since it uses as much as digits as its factorization.

244138751993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6531840, while the sum is 56.

The spelling of 244138751993 in words is "two hundred forty-four billion, one hundred thirty-eight million, seven hundred fifty-one thousand, nine hundred ninety-three".