168631357 has 2 divisors, whose sum is σ = 168631358. Its totient is φ = 168631356.

The previous prime is 168631339. The next prime is 168631363. The reversal of 168631357 is 753136861.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116877721 + 51753636 = 10811^2 + 7194^2 .

It is an emirp because it is prime and its reverse (753136861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 168631357 - 2¹¹ = 168629309 is a prime.

It is a super-2 number, since 2×168631357² = 56873069127322898, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168631157) 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, 84315678 + 84315679.

It is an arithmetic number, because the mean of its divisors is an integer number (84315679).

Almost surely, 2^168631357 is an apocalyptic number.

It is an amenable number.

168631357 is a deficient number, since it is larger than the sum of its proper divisors (1).

168631357 is an equidigital number, since it uses as much as digits as its factorization.

168631357 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 40.

The square root of 168631357 is about 12985.8136826307. The cubic root of 168631357 is about 552.4751879004.

The spelling of 168631357 in words is "one hundred sixty-eight million, six hundred thirty-one thousand, three hundred fifty-seven".