1525314521 has 2 divisors, whose sum is σ = 1525314522. Its totient is φ = 1525314520.

The previous prime is 1525314467. The next prime is 1525314523. The reversal of 1525314521 is 1254135251.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1255993600 + 269320921 = 35440^2 + 16411^2 .

It is an emirp because it is prime and its reverse (1254135251) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1525314521 is a prime.

Together with 1525314523, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1525314523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 762657260 + 762657261.

It is an arithmetic number, because the mean of its divisors is an integer number (762657261).

Almost surely, 2^1525314521 is an apocalyptic number.

It is an amenable number.

1525314521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1525314521 is an equidigital number, since it uses as much as digits as its factorization.

1525314521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6000, while the sum is 29.

The square root of 1525314521 is about 39055.2752006691. The cubic root of 1525314521 is about 1151.1178848779.

Adding to 1525314521 its reverse (1254135251), we get a palindrome (2779449772).

The spelling of 1525314521 in words is "one billion, five hundred twenty-five million, three hundred fourteen thousand, five hundred twenty-one".