163650961 has 4 divisors (see below), whose sum is σ = 164273472. Its totient is φ = 163028452.

The previous prime is 163650947. The next prime is 163650979. The reversal of 163650961 is 169056361.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-163650961 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 163650961.

It is not an unprimeable number, because it can be changed into a prime (163650941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 310861 + ... + 311386.

It is an arithmetic number, because the mean of its divisors is an integer number (41068368).

Almost surely, 2^163650961 is an apocalyptic number.

It is an amenable number.

163650961 is a deficient number, since it is larger than the sum of its proper divisors (622511).

163650961 is an equidigital number, since it uses as much as digits as its factorization.

163650961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622510.

The product of its (nonzero) digits is 29160, while the sum is 37.

The square root of 163650961 is about 12792.6135328165. The cubic root of 163650961 is about 546.9817713312.

The spelling of 163650961 in words is "one hundred sixty-three million, six hundred fifty thousand, nine hundred sixty-one".