157317289 has 2 divisors, whose sum is σ = 157317290. Its totient is φ = 157317288.

The previous prime is 157317271. The next prime is 157317299. The reversal of 157317289 is 982713751.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 141253225 + 16064064 = 11885^2 + 4008^2 .

It is an emirp because it is prime and its reverse (982713751) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 157317289 - 2⁷ = 157317161 is a prime.

It is not a weakly prime, because it can be changed into another prime (157317239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78658644 + 78658645.

It is an arithmetic number, because the mean of its divisors is an integer number (78658645).

Almost surely, 2^157317289 is an apocalyptic number.

It is an amenable number.

157317289 is a deficient number, since it is larger than the sum of its proper divisors (1).

157317289 is an equidigital number, since it uses as much as digits as its factorization.

157317289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105840, while the sum is 43.

The square root of 157317289 is about 12542.6189051569. The cubic root of 157317289 is about 539.8322398403.

The spelling of 157317289 in words is "one hundred fifty-seven million, three hundred seventeen thousand, two hundred eighty-nine".