1525561 has 2 divisors, whose sum is σ = 1525562. Its totient is φ = 1525560.

The previous prime is 1525507. The next prime is 1525571. The reversal of 1525561 is 1655251.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1336336 + 189225 = 1156^2 + 435^2 .

It is a cyclic number.

It is not a de Polignac number, because 1525561 - 2⁹ = 1525049 is a prime.

1525561 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1525501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 762780 + 762781.

It is an arithmetic number, because the mean of its divisors is an integer number (762781).

2^1525561 is an apocalyptic number.

It is an amenable number.

1525561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1525561 is an equidigital number, since it uses as much as digits as its factorization.

1525561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1500, while the sum is 25.

The square root of 1525561 is about 1235.1360248977. The cubic root of 1525561 is about 115.1179885447.

The spelling of 1525561 in words is "one million, five hundred twenty-five thousand, five hundred sixty-one".