1025343521 has 4 divisors (see below), whose sum is σ = 1025905344. Its totient is φ = 1024781700.

The previous prime is 1025343499. The next prime is 1025343523. The reversal of 1025343521 is 1253435201.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1253435201 = 1289 ⋅972409.

It is a cyclic number.

It is not a de Polignac number, because 1025343521 - 2¹⁰ = 1025342497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1025343523) 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, 278165 + ... + 281826.

It is an arithmetic number, because the mean of its divisors is an integer number (256476336).

Almost surely, 2^1025343521 is an apocalyptic number.

It is an amenable number.

1025343521 is a deficient number, since it is larger than the sum of its proper divisors (561823).

1025343521 is an equidigital number, since it uses as much as digits as its factorization.

1025343521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561822.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 1025343521 is about 32020.9856344242. The cubic root of 1025343521 is about 1008.3774624738.

Adding to 1025343521 its reverse (1253435201), we get a palindrome (2278778722).

The spelling of 1025343521 in words is "one billion, twenty-five million, three hundred forty-three thousand, five hundred twenty-one".