977221 has 8 divisors (see below), whose sum is σ = 1126080. Its totient is φ = 830688.

The previous prime is 977209. The next prime is 977233. The reversal of 977221 is 122779.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (977209) and next prime (977233).

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 977221 - 2⁹ = 976709 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 977221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (977021) 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, 450 + ... + 1468.

It is an arithmetic number, because the mean of its divisors is an integer number (140760).

2⁹⁷⁷²²¹ is an apocalyptic number.

It is an amenable number.

977221 is a deficient number, since it is larger than the sum of its proper divisors (148859).

977221 is a wasteful number, since it uses less digits than its factorization.

977221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1163.

The product of its digits is 1764, while the sum is 28.

The square root of 977221 is about 988.5448902301. The cubic root of 977221 is about 99.2348605476.

The spelling of 977221 in words is "nine hundred seventy-seven thousand, two hundred twenty-one".