1525213241 has 4 divisors (see below), whose sum is σ = 1525296372. Its totient is φ = 1525130112.

The previous prime is 1525213181. The next prime is 1525213247. The reversal of 1525213241 is 1423125251.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1423125251 = 19 ⋅74901329.

It can be written as a sum of positive squares in 2 ways, for example, as 774453241 + 750760000 = 27829^2 + 27400^2 .

It is a cyclic number.

It is not a de Polignac number, because 1525213241 - 2³⁰ = 451471417 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1525213241.

It is not an unprimeable number, because it can be changed into a prime (1525213247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 560 + ... + 55233.

It is an arithmetic number, because the mean of its divisors is an integer number (381324093).

Almost surely, 2^1525213241 is an apocalyptic number.

It is an amenable number.

1525213241 is a deficient number, since it is larger than the sum of its proper divisors (83131).

1525213241 is an equidigital number, since it uses as much as digits as its factorization.

1525213241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83130.

The product of its digits is 2400, while the sum is 26.

The square root of 1525213241 is about 39053.9785553278. The cubic root of 1525213241 is about 1151.0924064606.

Adding to 1525213241 its reverse (1423125251), we get a palindrome (2948338492).

The spelling of 1525213241 in words is "one billion, five hundred twenty-five million, two hundred thirteen thousand, two hundred forty-one".