6961221 has 18 divisors (see below), whose sum is σ = 10451142. Its totient is φ = 4636440.

The previous prime is 6961187. The next prime is 6961231. The reversal of 6961221 is 1221696.

It can be written as a sum of positive squares in only one way, i.e., 6305121 + 656100 = 2511^2 + 810^2 .

It is not a de Polignac number, because 6961221 - 2¹⁰ = 6960197 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6961231) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 6031 + ... + 7091.

It is an arithmetic number, because the mean of its divisors is an integer number (580619).

Almost surely, 2^6961221 is an apocalyptic number.

It is an amenable number.

6961221 is a deficient number, since it is larger than the sum of its proper divisors (3489921).

6961221 is an frugal number, since it uses more digits than its factorization.

6961221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1085 (or 1064 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 6961221 is about 2638.4125909342. The cubic root of 6961221 is about 190.9392184364.

The spelling of 6961221 in words is "six million, nine hundred sixty-one thousand, two hundred twenty-one".