621170161 has 8 divisors (see below), whose sum is σ = 624153600. Its totient is φ = 618194400.

The previous prime is 621170159. The next prime is 621170183. The reversal of 621170161 is 161071126.

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 621170161 - 2¹ = 621170159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (601170161) 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, 214320 + ... + 217198.

It is an arithmetic number, because the mean of its divisors is an integer number (78019200).

Almost surely, 2^621170161 is an apocalyptic number.

It is an amenable number.

621170161 is a deficient number, since it is larger than the sum of its proper divisors (2983439).

621170161 is a wasteful number, since it uses less digits than its factorization.

621170161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3839.

The product of its (nonzero) digits is 504, while the sum is 25.

The square root of 621170161 is about 24923.2855177643. The cubic root of 621170161 is about 853.2380120000.

The spelling of 621170161 in words is "six hundred twenty-one million, one hundred seventy thousand, one hundred sixty-one".