2451521 has 2 divisors, whose sum is σ = 2451522. Its totient is φ = 2451520.

The previous prime is 2451499. The next prime is 2451539. The reversal of 2451521 is 1251542.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2190400 + 261121 = 1480^2 + 511^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2451521 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2451493 and 2451502.

It is not a weakly prime, because it can be changed into another prime (2451541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1225760 + 1225761.

It is an arithmetic number, because the mean of its divisors is an integer number (1225761).

2^2451521 is an apocalyptic number.

It is an amenable number.

2451521 is a deficient number, since it is larger than the sum of its proper divisors (1).

2451521 is an equidigital number, since it uses as much as digits as its factorization.

2451521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 400, while the sum is 20.

The square root of 2451521 is about 1565.7333744926. The cubic root of 2451521 is about 134.8378666289.

The spelling of 2451521 in words is "two million, four hundred fifty-one thousand, five hundred twenty-one".