157444247 has 2 divisors, whose sum is σ = 157444248. Its totient is φ = 157444246.

The previous prime is 157444211. The next prime is 157444253. The reversal of 157444247 is 742444751.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 157444247 - 2²⁰ = 156395671 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 157444247.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157444207) 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, 78722123 + 78722124.

It is an arithmetic number, because the mean of its divisors is an integer number (78722124).

Almost surely, 2^157444247 is an apocalyptic number.

157444247 is a deficient number, since it is larger than the sum of its proper divisors (1).

157444247 is an equidigital number, since it uses as much as digits as its factorization.

157444247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 125440, while the sum is 38.

The square root of 157444247 is about 12547.6789487140. The cubic root of 157444247 is about 539.9774190375.

Adding to 157444247 its reverse (742444751), we get a palindrome (899888998).

It can be divided in two parts, 15744 and 4247, that added together give a palindrome (19991).

The spelling of 157444247 in words is "one hundred fifty-seven million, four hundred forty-four thousand, two hundred forty-seven".