1244431157 has 2 divisors, whose sum is σ = 1244431158. Its totient is φ = 1244431156.

The previous prime is 1244431099. The next prime is 1244431183. The reversal of 1244431157 is 7511344421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 739350481 + 505080676 = 27191^2 + 22474^2 .

It is a cyclic number.

It is not a de Polignac number, because 1244431157 - 2¹⁰ = 1244430133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1244431457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 622215578 + 622215579.

It is an arithmetic number, because the mean of its divisors is an integer number (622215579).

Almost surely, 2^1244431157 is an apocalyptic number.

It is an amenable number.

1244431157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1244431157 is an equidigital number, since it uses as much as digits as its factorization.

1244431157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13440, while the sum is 32.

The square root of 1244431157 is about 35276.4958152025. The cubic root of 1244431157 is about 1075.6152690604.

Adding to 1244431157 its reverse (7511344421), we get a palindrome (8755775578).

The spelling of 1244431157 in words is "one billion, two hundred forty-four million, four hundred thirty-one thousand, one hundred fifty-seven".