163445813 has 2 divisors, whose sum is σ = 163445814. Its totient is φ = 163445812.

The previous prime is 163445749. The next prime is 163445831. The reversal of 163445813 is 318544361.

Together with next prime (163445831) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 158810404 + 4635409 = 12602^2 + 2153^2 .

It is a cyclic number.

It is not a de Polignac number, because 163445813 - 2⁶ = 163445749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163445213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81722906 + 81722907.

It is an arithmetic number, because the mean of its divisors is an integer number (81722907).

Almost surely, 2^163445813 is an apocalyptic number.

It is an amenable number.

163445813 is a deficient number, since it is larger than the sum of its proper divisors (1).

163445813 is an equidigital number, since it uses as much as digits as its factorization.

163445813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 35.

The square root of 163445813 is about 12784.5927975826. The cubic root of 163445813 is about 546.7531157074.

The spelling of 163445813 in words is "one hundred sixty-three million, four hundred forty-five thousand, eight hundred thirteen".