163264781 has 2 divisors, whose sum is σ = 163264782. Its totient is φ = 163264780.

The previous prime is 163264733. The next prime is 163264799. The reversal of 163264781 is 187462361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 103836100 + 59428681 = 10190^2 + 7709^2 .

It is an emirp because it is prime and its reverse (187462361) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-163264781 is a prime.

It is a super-2 number, since 2×163264781² = 53310777429955922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163264081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81632390 + 81632391.

It is an arithmetic number, because the mean of its divisors is an integer number (81632391).

Almost surely, 2^163264781 is an apocalyptic number.

It is an amenable number.

163264781 is a deficient number, since it is larger than the sum of its proper divisors (1).

163264781 is an equidigital number, since it uses as much as digits as its factorization.

163264781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 38.

The square root of 163264781 is about 12777.5107513162. The cubic root of 163264781 is about 546.5511805340.

The spelling of 163264781 in words is "one hundred sixty-three million, two hundred sixty-four thousand, seven hundred eighty-one".