103145521 has 2 divisors, whose sum is σ = 103145522. Its totient is φ = 103145520.

The previous prime is 103145513. The next prime is 103145527. The reversal of 103145521 is 125541301.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90041121 + 13104400 = 9489^2 + 3620^2 .

It is an emirp because it is prime and its reverse (125541301) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 103145521 - 2³ = 103145513 is a prime.

It is a super-2 number, since 2×103145521² = 21277997004722882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 103145492 and 103145501.

It is not a weakly prime, because it can be changed into another prime (103145527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51572760 + 51572761.

It is an arithmetic number, because the mean of its divisors is an integer number (51572761).

Almost surely, 2^103145521 is an apocalyptic number.

It is an amenable number.

103145521 is a deficient number, since it is larger than the sum of its proper divisors (1).

103145521 is an equidigital number, since it uses as much as digits as its factorization.

103145521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 103145521 is about 10156.0583397300. The cubic root of 103145521 is about 468.9754670952.

Adding to 103145521 its reverse (125541301), we get a palindrome (228686822).

The spelling of 103145521 in words is "one hundred three million, one hundred forty-five thousand, five hundred twenty-one".