157985329 has 2 divisors, whose sum is σ = 157985330. Its totient is φ = 157985328.

The previous prime is 157985327. The next prime is 157985339. The reversal of 157985329 is 923589751.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 132250000 + 25735329 = 11500^2 + 5073^2 .

It is a cyclic number.

It is not a de Polignac number, because 157985329 - 2¹ = 157985327 is a prime.

Together with 157985327, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (157985327) 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, 78992664 + 78992665.

It is an arithmetic number, because the mean of its divisors is an integer number (78992665).

Almost surely, 2^157985329 is an apocalyptic number.

It is an amenable number.

157985329 is a deficient number, since it is larger than the sum of its proper divisors (1).

157985329 is an equidigital number, since it uses as much as digits as its factorization.

157985329 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 680400, while the sum is 49.

The square root of 157985329 is about 12569.2214953831. The cubic root of 157985329 is about 540.5952843168.

The spelling of 157985329 in words is "one hundred fifty-seven million, nine hundred eighty-five thousand, three hundred twenty-nine".