401547221 has 2 divisors, whose sum is σ = 401547222. Its totient is φ = 401547220.

The previous prime is 401547193. The next prime is 401547227. The reversal of 401547221 is 122745104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 267682321 + 133864900 = 16361^2 + 11570^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-401547221 is a prime.

It is a super-2 number, since 2×401547221² = 322480341385645682, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401547227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200773610 + 200773611.

It is an arithmetic number, because the mean of its divisors is an integer number (200773611).

Almost surely, 2^401547221 is an apocalyptic number.

It is an amenable number.

401547221 is a deficient number, since it is larger than the sum of its proper divisors (1).

401547221 is an equidigital number, since it uses as much as digits as its factorization.

401547221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 401547221 is about 20038.6431925917. The cubic root of 401547221 is about 737.7550792844.

The spelling of 401547221 in words is "four hundred one million, five hundred forty-seven thousand, two hundred twenty-one".