3521257 has 2 divisors, whose sum is σ = 3521258. Its totient is φ = 3521256.

The previous prime is 3521249. The next prime is 3521281. The reversal of 3521257 is 7521253.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2972176 + 549081 = 1724^2 + 741^2 .

It is a cyclic number.

It is not a de Polignac number, because 3521257 - 2³ = 3521249 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (3521237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1760628 + 1760629.

It is an arithmetic number, because the mean of its divisors is an integer number (1760629).

Almost surely, 2^3521257 is an apocalyptic number.

It is an amenable number.

3521257 is a deficient number, since it is larger than the sum of its proper divisors (1).

3521257 is an equidigital number, since it uses as much as digits as its factorization.

3521257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2100, while the sum is 25.

The square root of 3521257 is about 1876.5012656537. The cubic root of 3521257 is about 152.1362035151.

The spelling of 3521257 in words is "three million, five hundred twenty-one thousand, two hundred fifty-seven".