157687429 has 2 divisors, whose sum is σ = 157687430. Its totient is φ = 157687428.

The previous prime is 157687417. The next prime is 157687433. The reversal of 157687429 is 924786751.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88830625 + 68856804 = 9425^2 + 8298^2 .

It is a cyclic number.

It is not a de Polignac number, because 157687429 - 2¹⁵ = 157654661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157687469) 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, 78843714 + 78843715.

It is an arithmetic number, because the mean of its divisors is an integer number (78843715).

Almost surely, 2^157687429 is an apocalyptic number.

It is an amenable number.

157687429 is a deficient number, since it is larger than the sum of its proper divisors (1).

157687429 is an equidigital number, since it uses as much as digits as its factorization.

157687429 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 846720, while the sum is 49.

The square root of 157687429 is about 12557.3655278486. The cubic root of 157687429 is about 540.2552851019.

The spelling of 157687429 in words is "one hundred fifty-seven million, six hundred eighty-seven thousand, four hundred twenty-nine".