1244669137 has 4 divisors (see below), whose sum is σ = 1244841316. Its totient is φ = 1244496960.

The previous prime is 1244669131. The next prime is 1244669143. The reversal of 1244669137 is 7319664421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7319664421 = 3697 ⋅1979893.

It is an interprime number because it is at equal distance from previous prime (1244669131) and next prime (1244669143).

It can be written as a sum of positive squares in 2 ways, for example, as 530657296 + 714011841 = 23036^2 + 26721^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1244669137 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1244669093 and 1244669102.

It is not an unprimeable number, because it can be changed into a prime (1244669131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74748 + ... + 89869.

It is an arithmetic number, because the mean of its divisors is an integer number (311210329).

Almost surely, 2^1244669137 is an apocalyptic number.

It is an amenable number.

1244669137 is a deficient number, since it is larger than the sum of its proper divisors (172179).

1244669137 is an equidigital number, since it uses as much as digits as its factorization.

1244669137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172178.

The product of its digits is 217728, while the sum is 43.

The square root of 1244669137 is about 35279.8687214111. The cubic root of 1244669137 is about 1075.6838301335.

The spelling of 1244669137 in words is "one billion, two hundred forty-four million, six hundred sixty-nine thousand, one hundred thirty-seven".