1525551 has 4 divisors (see below), whose sum is σ = 2034072. Its totient is φ = 1017032.

The previous prime is 1525507. The next prime is 1525561. The reversal of 1525551 is 1555251.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1555251 = 3 ⋅518417.

It is a cyclic number.

It is not a de Polignac number, because 1525551 - 2⁷ = 1525423 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1525501) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 254256 + ... + 254261.

It is an arithmetic number, because the mean of its divisors is an integer number (508518).

2^1525551 is an apocalyptic number.

1525551 is a deficient number, since it is larger than the sum of its proper divisors (508521).

1525551 is an equidigital number, since it uses as much as digits as its factorization.

1525551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 508520.

The product of its digits is 1250, while the sum is 24.

The square root of 1525551 is about 1235.1319767539. The cubic root of 1525551 is about 115.1177370126.

The spelling of 1525551 in words is "one million, five hundred twenty-five thousand, five hundred fifty-one".