1025859521 has 8 divisors (see below), whose sum is σ = 1055361384. Its totient is φ = 996451200.

The previous prime is 1025859517. The next prime is 1025859581. The reversal of 1025859521 is 1259585201.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 582546496 + 443313025 = 24136^2 + 21055^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1025859521 - 2² = 1025859517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1025859581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 830 + ... + 45303.

It is an arithmetic number, because the mean of its divisors is an integer number (131920173).

Almost surely, 2^1025859521 is an apocalyptic number.

It is an amenable number.

1025859521 is a deficient number, since it is larger than the sum of its proper divisors (29501863).

1025859521 is an equidigital number, since it uses as much as digits as its factorization.

1025859521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46771.

The product of its (nonzero) digits is 36000, while the sum is 38.

The square root of 1025859521 is about 32029.0418370578. The cubic root of 1025859521 is about 1008.5465880728.

The spelling of 1025859521 in words is "one billion, twenty-five million, eight hundred fifty-nine thousand, five hundred twenty-one".