2723521 has 2 divisors, whose sum is σ = 2723522. Its totient is φ = 2723520.

The previous prime is 2723503. The next prime is 2723543. The reversal of 2723521 is 1253272.

It is an a-pointer prime, because the next prime (2723543) can be obtained adding 2723521 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1537600 + 1185921 = 1240^2 + 1089^2 .

It is a cyclic number.

It is not a de Polignac number, because 2723521 - 2⁷ = 2723393 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2723492 and 2723501.

It is not a weakly prime, because it can be changed into another prime (2723551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1361760 + 1361761.

It is an arithmetic number, because the mean of its divisors is an integer number (1361761).

2^2723521 is an apocalyptic number.

It is an amenable number.

2723521 is a deficient number, since it is larger than the sum of its proper divisors (1).

2723521 is an equidigital number, since it uses as much as digits as its factorization.

2723521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 840, while the sum is 22.

The square root of 2723521 is about 1650.3093649374. The cubic root of 2723521 is about 139.6508476440.

Adding to 2723521 its reverse (1253272), we get a palindrome (3976793).

The spelling of 2723521 in words is "two million, seven hundred twenty-three thousand, five hundred twenty-one".