621161 has 8 divisors (see below), whose sum is σ = 656640. Its totient is φ = 586432.

The previous prime is 621143. The next prime is 621217. The reversal of 621161 is 161126.

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 621161 - 2⁶ = 621097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2480 + ... + 2718.

It is an arithmetic number, because the mean of its divisors is an integer number (82080).

2⁶²¹¹⁶¹ is an apocalyptic number.

It is an amenable number.

621161 is a deficient number, since it is larger than the sum of its proper divisors (35479).

621161 is a wasteful number, since it uses less digits than its factorization.

621161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375.

The product of its digits is 72, while the sum is 17.

The square root of 621161 is about 788.1376783278. The cubic root of 621161 is about 85.3233817469.

Adding to 621161 its reverse (161126), we get a palindrome (782287).

The spelling of 621161 in words is "six hundred twenty-one thousand, one hundred sixty-one".