157239629 has 2 divisors, whose sum is σ = 157239630. Its totient is φ = 157239628.

The previous prime is 157239623. The next prime is 157239631. The reversal of 157239629 is 926932751.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109767529 + 47472100 = 10477^2 + 6890^2 .

It is an emirp because it is prime and its reverse (926932751) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 157239629 - 2⁸ = 157239373 is a prime.

It is a Sophie Germain prime.

Together with 157239631, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 157239629.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157239623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78619814 + 78619815.

It is an arithmetic number, because the mean of its divisors is an integer number (78619815).

Almost surely, 2^157239629 is an apocalyptic number.

It is an amenable number.

157239629 is a deficient number, since it is larger than the sum of its proper divisors (1).

157239629 is an equidigital number, since it uses as much as digits as its factorization.

157239629 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 204120, while the sum is 44.

The square root of 157239629 is about 12539.5226783159. The cubic root of 157239629 is about 539.7433954579.

It can be divided in two parts, 15723 and 9629, that added together give a palindrome (25352).

The spelling of 157239629 in words is "one hundred fifty-seven million, two hundred thirty-nine thousand, six hundred twenty-nine".