163620493 has 2 divisors, whose sum is σ = 163620494. Its totient is φ = 163620492.

The previous prime is 163620491. The next prime is 163620557. The reversal of 163620493 is 394026361.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129549924 + 34070569 = 11382^2 + 5837^2 .

It is an emirp because it is prime and its reverse (394026361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 163620493 - 2¹ = 163620491 is a prime.

Together with 163620491, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163620491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81810246 + 81810247.

It is an arithmetic number, because the mean of its divisors is an integer number (81810247).

Almost surely, 2^163620493 is an apocalyptic number.

It is an amenable number.

163620493 is a deficient number, since it is larger than the sum of its proper divisors (1).

163620493 is an equidigital number, since it uses as much as digits as its factorization.

163620493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 34.

The square root of 163620493 is about 12791.4226339372. The cubic root of 163620493 is about 546.9478241328.

The spelling of 163620493 in words is "one hundred sixty-three million, six hundred twenty thousand, four hundred ninety-three".