1244192681 has 2 divisors, whose sum is σ = 1244192682. Its totient is φ = 1244192680.

The previous prime is 1244192671. The next prime is 1244192687. The reversal of 1244192681 is 1862914421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 867832681 + 376360000 = 29459^2 + 19400^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1244192681 is a prime.

It is a super-2 number, since 2×1244192681² = 3096030854907935522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1244192687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 622096340 + 622096341.

It is an arithmetic number, because the mean of its divisors is an integer number (622096341).

Almost surely, 2^1244192681 is an apocalyptic number.

It is an amenable number.

1244192681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1244192681 is an equidigital number, since it uses as much as digits as its factorization.

1244192681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 38.

The square root of 1244192681 is about 35273.1155556183. The cubic root of 1244192681 is about 1075.5465563230.

The spelling of 1244192681 in words is "one billion, two hundred forty-four million, one hundred ninety-two thousand, six hundred eighty-one".