3610721 has 2 divisors, whose sum is σ = 3610722. Its totient is φ = 3610720.

The previous prime is 3610709. The next prime is 3610723. The reversal of 3610721 is 1270163.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3478225 + 132496 = 1865^2 + 364^2 .

It is a cyclic number.

It is not a de Polignac number, because 3610721 - 2⁶ = 3610657 is a prime.

It is a super-2 number, since 2×3610721² = 26074612279682, which contains 22 as substring.

Together with 3610723, it forms a pair of twin primes.

It is a Chen prime.

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

It is a junction number, because it is equal to n+sod(n) for n = 3610693 and 3610702.

It is not a weakly prime, because it can be changed into another prime (3610723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1805360 + 1805361.

It is an arithmetic number, because the mean of its divisors is an integer number (1805361).

Almost surely, 2^3610721 is an apocalyptic number.

It is an amenable number.

3610721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3610721 is an equidigital number, since it uses as much as digits as its factorization.

3610721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 3610721 is about 1900.1897273693. The cubic root of 3610721 is about 153.4138765043.

Adding to 3610721 its reverse (1270163), we get a palindrome (4880884).

The spelling of 3610721 in words is "three million, six hundred ten thousand, seven hundred twenty-one".