2687521 has 2 divisors, whose sum is σ = 2687522. Its totient is φ = 2687520.

The previous prime is 2687497. The next prime is 2687537. The reversal of 2687521 is 1257862.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2676496 + 11025 = 1636^2 + 105^2 .

It is a cyclic number.

It is not a de Polignac number, because 2687521 - 2⁷ = 2687393 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2687551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1343760 + 1343761.

It is an arithmetic number, because the mean of its divisors is an integer number (1343761).

2^2687521 is an apocalyptic number.

It is an amenable number.

2687521 is a deficient number, since it is larger than the sum of its proper divisors (1).

2687521 is an equidigital number, since it uses as much as digits as its factorization.

2687521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6720, while the sum is 31.

The square root of 2687521 is about 1639.3660360029. The cubic root of 2687521 is about 139.0328062931.

It can be divided in two parts, 26875 and 21, that added together give a square (26896 = 164²).

The spelling of 2687521 in words is "two million, six hundred eighty-seven thousand, five hundred twenty-one".