1525155521 has 2 divisors, whose sum is σ = 1525155522. Its totient is φ = 1525155520.

The previous prime is 1525155481. The next prime is 1525155547. The reversal of 1525155521 is 1255515251.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1485023296 + 40132225 = 38536^2 + 6335^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1525155521 is a prime.

It is not a weakly prime, because it can be changed into another prime (1525155551) 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 as a sum of consecutive naturals, namely, 762577760 + 762577761.

It is an arithmetic number, because the mean of its divisors is an integer number (762577761).

Almost surely, 2^1525155521 is an apocalyptic number.

It is an amenable number.

1525155521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1525155521 is an equidigital number, since it uses as much as digits as its factorization.

1525155521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12500, while the sum is 32.

The square root of 1525155521 is about 39053.2395711291. The cubic root of 1525155521 is about 1151.0778856731.

The spelling of 1525155521 in words is "one billion, five hundred twenty-five million, one hundred fifty-five thousand, five hundred twenty-one".