1525021 has 2 divisors, whose sum is σ = 1525022. Its totient is φ = 1525020.

The previous prime is 1524989. The next prime is 1525031. The reversal of 1525021 is 1205251.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 902500 + 622521 = 950^2 + 789^2 .

It is an emirp because it is prime and its reverse (1205251) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1525021 - 2⁵ = 1524989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1524986 and 1525004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1525031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 762510 + 762511.

It is an arithmetic number, because the mean of its divisors is an integer number (762511).

2^1525021 is an apocalyptic number.

It is an amenable number.

1525021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1525021 is an equidigital number, since it uses as much as digits as its factorization.

1525021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 1525021 is about 1234.9174061450. The cubic root of 1525021 is about 115.1044042414.

The spelling of 1525021 in words is "one million, five hundred twenty-five thousand, twenty-one".