171396157 has 2 divisors, whose sum is σ = 171396158. Its totient is φ = 171396156.

The previous prime is 171396149. The next prime is 171396163. The reversal of 171396157 is 751693171.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 125305636 + 46090521 = 11194^2 + 6789^2 .

It is an emirp because it is prime and its reverse (751693171) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 171396157 - 2³ = 171396149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (171396167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85698078 + 85698079.

It is an arithmetic number, because the mean of its divisors is an integer number (85698079).

Almost surely, 2^171396157 is an apocalyptic number.

It is an amenable number.

171396157 is a deficient number, since it is larger than the sum of its proper divisors (1).

171396157 is an equidigital number, since it uses as much as digits as its factorization.

171396157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 39690, while the sum is 40.

The square root of 171396157 is about 13091.8355092019. The cubic root of 171396157 is about 555.4782091624.

The spelling of 171396157 in words is "one hundred seventy-one million, three hundred ninety-six thousand, one hundred fifty-seven".