8215961 has 32 divisors (see below), whose sum is σ = 10214400. Its totient is φ = 6531840.

The previous prime is 8215957. The next prime is 8215969. The reversal of 8215961 is 1695128.

It is a cyclic number.

It is not a de Polignac number, because 8215961 - 2² = 8215957 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8215969) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 222035 + ... + 222071.

It is an arithmetic number, because the mean of its divisors is an integer number (319200).

Almost surely, 2^8215961 is an apocalyptic number.

It is an amenable number.

8215961 is a deficient number, since it is larger than the sum of its proper divisors (1998439).

8215961 is a wasteful number, since it uses less digits than its factorization.

8215961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129.

The product of its digits is 4320, while the sum is 32.

The square root of 8215961 is about 2866.3497693059. The cubic root of 8215961 is about 201.7837194318.

The spelling of 8215961 in words is "eight million, two hundred fifteen thousand, nine hundred sixty-one".