956221001 has 4 divisors (see below), whose sum is σ = 957902100. Its totient is φ = 954539904.

The previous prime is 956220989. The next prime is 956221003. The reversal of 956221001 is 100122659.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 339443776 + 616777225 = 18424^2 + 24835^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-956221001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (956221003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 839696 + ... + 840833.

It is an arithmetic number, because the mean of its divisors is an integer number (239475525).

Almost surely, 2^956221001 is an apocalyptic number.

It is an amenable number.

956221001 is a deficient number, since it is larger than the sum of its proper divisors (1681099).

956221001 is a wasteful number, since it uses less digits than its factorization.

956221001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1681098.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 956221001 is about 30922.8233025382. The cubic root of 956221001 is about 985.1887090666.

The spelling of 956221001 in words is "nine hundred fifty-six million, two hundred twenty-one thousand, one".