163913639 has 2 divisors, whose sum is σ = 163913640. Its totient is φ = 163913638.

The previous prime is 163913611. The next prime is 163913641. The reversal of 163913639 is 936319361.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 163913639 - 2⁸ = 163913383 is a prime.

Together with 163913641, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 163913596 and 163913605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163903639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81956819 + 81956820.

It is an arithmetic number, because the mean of its divisors is an integer number (81956820).

Almost surely, 2^163913639 is an apocalyptic number.

163913639 is a deficient number, since it is larger than the sum of its proper divisors (1).

163913639 is an equidigital number, since it uses as much as digits as its factorization.

163913639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 78732, while the sum is 41.

The square root of 163913639 is about 12802.8762002919. The cubic root of 163913639 is about 547.2742704223.

The spelling of 163913639 in words is "one hundred sixty-three million, nine hundred thirteen thousand, six hundred thirty-nine".