2987521 has 2 divisors, whose sum is σ = 2987522. Its totient is φ = 2987520.

The previous prime is 2987519. The next prime is 2987533. The reversal of 2987521 is 1257892.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2772225 + 215296 = 1665^2 + 464^2 .

It is a cyclic number.

It is not a de Polignac number, because 2987521 - 2¹ = 2987519 is a prime.

Together with 2987519, it forms a pair of twin primes.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (2987561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1493760 + 1493761.

It is an arithmetic number, because the mean of its divisors is an integer number (1493761).

2^2987521 is an apocalyptic number.

It is an amenable number.

2987521 is a deficient number, since it is larger than the sum of its proper divisors (1).

2987521 is an equidigital number, since it uses as much as digits as its factorization.

2987521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 34.

The square root of 2987521 is about 1728.4446765807. Note that the first 3 decimals coincide. The cubic root of 2987521 is about 144.0247031951.

The spelling of 2987521 in words is "two million, nine hundred eighty-seven thousand, five hundred twenty-one".