163949761 has 8 divisors (see below), whose sum is σ = 167957504. Its totient is φ = 159984720.

The previous prime is 163949749. The next prime is 163949777. The reversal of 163949761 is 167949361.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 163949761 - 2⁷ = 163949633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163949741) 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 in 7 ways as a sum of consecutive naturals, for example, 2835 + ... + 18328.

It is an arithmetic number, because the mean of its divisors is an integer number (20994688).

Almost surely, 2^163949761 is an apocalyptic number.

It is an amenable number.

163949761 is a deficient number, since it is larger than the sum of its proper divisors (4007743).

163949761 is a wasteful number, since it uses less digits than its factorization.

163949761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21351.

The product of its digits is 244944, while the sum is 46.

The square root of 163949761 is about 12804.2868212173. The cubic root of 163949761 is about 547.3144688043.

The spelling of 163949761 in words is "one hundred sixty-three million, nine hundred forty-nine thousand, seven hundred sixty-one".