163651421 has 8 divisors (see below), whose sum is σ = 167655840. Its totient is φ = 159656112.

The previous prime is 163651409. The next prime is 163651429. The reversal of 163651421 is 124156361.

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 163651421 - 2²⁶ = 96542557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163651429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46595 + ... + 49983.

It is an arithmetic number, because the mean of its divisors is an integer number (20956980).

Almost surely, 2^163651421 is an apocalyptic number.

It is an amenable number.

163651421 is a deficient number, since it is larger than the sum of its proper divisors (4004419).

163651421 is a wasteful number, since it uses less digits than its factorization.

163651421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4555.

The product of its digits is 4320, while the sum is 29.

The square root of 163651421 is about 12792.6315119290. The cubic root of 163651421 is about 546.9822838272.

The spelling of 163651421 in words is "one hundred sixty-three million, six hundred fifty-one thousand, four hundred twenty-one".