1821525 has 24 divisors (see below), whose sum is σ = 3050400. Its totient is φ = 959040.

The previous prime is 1821509. The next prime is 1821541. The reversal of 1821525 is 5251281.

It is an interprime number because it is at equal distance from previous prime (1821509) and next prime (1821541).

It is not a de Polignac number, because 1821525 - 2⁴ = 1821509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1821495 and 1821504.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11094 + ... + 11256.

It is an arithmetic number, because the mean of its divisors is an integer number (127100).

2^1821525 is an apocalyptic number.

1821525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1821525 is a deficient number, since it is larger than the sum of its proper divisors (1228875).

1821525 is a wasteful number, since it uses less digits than its factorization.

1821525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325 (or 320 counting only the distinct ones).

The product of its digits is 800, while the sum is 24.

The square root of 1821525 is about 1349.6388405792. The cubic root of 1821525 is about 122.1270064977.

It can be divided in two parts, 1821 and 525, that added together give a triangular number (2346 = T₆₈).

The spelling of 1821525 in words is "one million, eight hundred twenty-one thousand, five hundred twenty-five".