3725221 has 2 divisors, whose sum is σ = 3725222. Its totient is φ = 3725220.

The previous prime is 3725213. The next prime is 3725231. The reversal of 3725221 is 1225273.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3101121 + 624100 = 1761^2 + 790^2 .

It is a cyclic number.

It is not a de Polignac number, because 3725221 - 2³ = 3725213 is a prime.

It is a Chen prime.

3725221 is a lucky number.

It is equal to p₂₆₅₀₇₂ and since 3725221 and 265072 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 3725192 and 3725201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3725231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1862610 + 1862611.

It is an arithmetic number, because the mean of its divisors is an integer number (1862611).

Almost surely, 2^3725221 is an apocalyptic number.

It is an amenable number.

3725221 is a deficient number, since it is larger than the sum of its proper divisors (1).

3725221 is an equidigital number, since it uses as much as digits as its factorization.

3725221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 840, while the sum is 22.

The square root of 3725221 is about 1930.0831588302. The cubic root of 3725221 is about 155.0186727417.

It can be divided in two parts, 37252 and 21, that added together give a palindrome (37273).

The spelling of 3725221 in words is "three million, seven hundred twenty-five thousand, two hundred twenty-one".