877281221 has 2 divisors, whose sum is σ = 877281222. Its totient is φ = 877281220.

The previous prime is 877281217. The next prime is 877281239. The reversal of 877281221 is 122182778.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 604668100 + 272613121 = 24590^2 + 16511^2 .

It is a cyclic number.

It is not a de Polignac number, because 877281221 - 2² = 877281217 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (877281271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 438640610 + 438640611.

It is an arithmetic number, because the mean of its divisors is an integer number (438640611).

Almost surely, 2^877281221 is an apocalyptic number.

It is an amenable number.

877281221 is a deficient number, since it is larger than the sum of its proper divisors (1).

877281221 is an equidigital number, since it uses as much as digits as its factorization.

877281221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25088, while the sum is 38.

The square root of 877281221 is about 29618.9334885644. The cubic root of 877281221 is about 957.2960736625.

The spelling of 877281221 in words is "eight hundred seventy-seven million, two hundred eighty-one thousand, two hundred twenty-one".