3690521 has 2 divisors, whose sum is σ = 3690522. Its totient is φ = 3690520.

The previous prime is 3690517. The next prime is 3690523. The reversal of 3690521 is 1250963.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3200521 + 490000 = 1789^2 + 700^2 .

It is a cyclic number.

It is not a de Polignac number, because 3690521 - 2² = 3690517 is a prime.

Together with 3690523, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (3690523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1845260 + 1845261.

It is an arithmetic number, because the mean of its divisors is an integer number (1845261).

Almost surely, 2^3690521 is an apocalyptic number.

It is an amenable number.

3690521 is a deficient number, since it is larger than the sum of its proper divisors (1).

3690521 is an equidigital number, since it uses as much as digits as its factorization.

3690521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 3690521 is about 1921.0728773266. The cubic root of 3690521 is about 154.5358434937.

The spelling of 3690521 in words is "three million, six hundred ninety thousand, five hundred twenty-one".