401177221 has 2 divisors, whose sum is σ = 401177222. Its totient is φ = 401177220.

The previous prime is 401177197. The next prime is 401177279. The reversal of 401177221 is 122771104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 305900100 + 95277121 = 17490^2 + 9761^2 .

It is a cyclic number.

It is not a de Polignac number, because 401177221 - 2⁷ = 401177093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401177291) 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 as a sum of consecutive naturals, namely, 200588610 + 200588611.

It is an arithmetic number, because the mean of its divisors is an integer number (200588611).

Almost surely, 2^401177221 is an apocalyptic number.

It is an amenable number.

401177221 is a deficient number, since it is larger than the sum of its proper divisors (1).

401177221 is an equidigital number, since it uses as much as digits as its factorization.

401177221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 784, while the sum is 25.

The square root of 401177221 is about 20029.4089029107. The cubic root of 401177221 is about 737.5284116604.

The spelling of 401177221 in words is "four hundred one million, one hundred seventy-seven thousand, two hundred twenty-one".