163615391 has 2 divisors, whose sum is σ = 163615392. Its totient is φ = 163615390.

The previous prime is 163615373. The next prime is 163615393. The reversal of 163615391 is 193516361.

It is a strong prime.

It is an emirp because it is prime and its reverse (193516361) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-163615391 is a prime.

Together with 163615393, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163615393) 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, 81807695 + 81807696.

It is an arithmetic number, because the mean of its divisors is an integer number (81807696).

Almost surely, 2^163615391 is an apocalyptic number.

163615391 is a deficient number, since it is larger than the sum of its proper divisors (1).

163615391 is an equidigital number, since it uses as much as digits as its factorization.

163615391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14580, while the sum is 35.

The square root of 163615391 is about 12791.2232018678. The cubic root of 163615391 is about 546.9421391138.

The spelling of 163615391 in words is "one hundred sixty-three million, six hundred fifteen thousand, three hundred ninety-one".