163857493 has 2 divisors, whose sum is σ = 163857494. Its totient is φ = 163857492.

The previous prime is 163857487. The next prime is 163857517. The reversal of 163857493 is 394758361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 134513604 + 29343889 = 11598^2 + 5417^2 .

It is a cyclic number.

It is not a de Polignac number, because 163857493 - 2⁵ = 163857461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163857403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81928746 + 81928747.

It is an arithmetic number, because the mean of its divisors is an integer number (81928747).

Almost surely, 2^163857493 is an apocalyptic number.

It is an amenable number.

163857493 is a deficient number, since it is larger than the sum of its proper divisors (1).

163857493 is an equidigital number, since it uses as much as digits as its factorization.

163857493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 544320, while the sum is 46.

The square root of 163857493 is about 12800.6833020742. The cubic root of 163857493 is about 547.2117765985.

The spelling of 163857493 in words is "one hundred sixty-three million, eight hundred fifty-seven thousand, four hundred ninety-three".