3521857 has 2 divisors, whose sum is σ = 3521858. Its totient is φ = 3521856.

The previous prime is 3521831. The next prime is 3521867. The reversal of 3521857 is 7581253.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2178576 + 1343281 = 1476^2 + 1159^2 .

It is an emirp because it is prime and its reverse (7581253) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3521857 - 2⁷ = 3521729 is a prime.

It is not a weakly prime, because it can be changed into another prime (3521867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1760928 + 1760929.

It is an arithmetic number, because the mean of its divisors is an integer number (1760929).

Almost surely, 2^3521857 is an apocalyptic number.

It is an amenable number.

3521857 is a deficient number, since it is larger than the sum of its proper divisors (1).

3521857 is an equidigital number, since it uses as much as digits as its factorization.

3521857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8400, while the sum is 31.

The square root of 3521857 is about 1876.6611308385. The cubic root of 3521857 is about 152.1448440411.

It can be divided in two parts, 352 and 1857, that added together give a square (2209 = 47²).

The spelling of 3521857 in words is "three million, five hundred twenty-one thousand, eight hundred fifty-seven".