3508721 has 2 divisors, whose sum is σ = 3508722. Its totient is φ = 3508720.

The previous prime is 3508717. The next prime is 3508733. The reversal of 3508721 is 1278053.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3474496 + 34225 = 1864^2 + 185^2 .

It is a cyclic number.

It is not a de Polignac number, because 3508721 - 2² = 3508717 is a prime.

It is a super-2 number, since 2×3508721² = 24622246111682, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (3508741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1754360 + 1754361.

It is an arithmetic number, because the mean of its divisors is an integer number (1754361).

Almost surely, 2^3508721 is an apocalyptic number.

It is an amenable number.

3508721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3508721 is an equidigital number, since it uses as much as digits as its factorization.

3508721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 3508721 is about 1873.1580285710. The cubic root of 3508721 is about 151.9554492012.

The spelling of 3508721 in words is "three million, five hundred eight thousand, seven hundred twenty-one".